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Annotation of 41BSD/sys/h/inode.h, revision 1.1

1.1     ! root        1: /*     inode.h 4.1     11/9/80 */
        !             2: 
        !             3: /*
        !             4:  * The I node is the focus of all
        !             5:  * file activity in unix. There is a unique
        !             6:  * inode allocated for each active file,
        !             7:  * each current directory, each mounted-on
        !             8:  * file, text file, and the root. An inode is 'named'
        !             9:  * by its dev/inumber pair. (iget/iget.c)
        !            10:  * Data, from mode on, is read in
        !            11:  * from permanent inode on volume.
        !            12:  */
        !            13: 
        !            14: #define        NADDR   13
        !            15: 
        !            16: #define        NINDEX          15
        !            17: struct group
        !            18: {
        !            19:        short   g_state;
        !            20:        char    g_index;
        !            21:        char    g_rot;
        !            22:        struct  group   *g_group;
        !            23:        struct  inode   *g_inode;
        !            24:        struct  file    *g_file;
        !            25:        short   g_rotmask;
        !            26:        short   g_datq;
        !            27:        struct  chan *g_chans[NINDEX];
        !            28: };
        !            29: struct inode
        !            30: {
        !            31:        char    i_flag;
        !            32:        char    i_count;        /* reference count */
        !            33:        dev_t   i_dev;          /* device where inode resides */
        !            34:        ino_t   i_number;       /* i number, 1-to-1 with device address */
        !            35:        unsigned short i_mode;
        !            36:        short   i_nlink;        /* directory entries */
        !            37:        short   i_uid;          /* owner */
        !            38:        short   i_gid;          /* group of owner */
        !            39:        off_t   i_size;         /* size of file */
        !            40:        union {
        !            41:                struct {
        !            42:                        daddr_t I_addr[NADDR];  /* if normal file/directory */
        !            43:                        daddr_t I_lastr;        /* last read (for read-ahead) */
        !            44:                } i_f;
        !            45: #define        i_addr  i_f.I_addr
        !            46: #define        i_lastr i_f.I_lastr
        !            47:                struct {
        !            48:                        daddr_t I_rdev;         /* i_addr[0] */
        !            49:                        struct  group I_group;  /* multiplexor group file */
        !            50:                } i_d;
        !            51: #define        i_rdev  i_d.I_rdev
        !            52: #define        i_group i_d.I_group
        !            53:        } i_un;
        !            54:        short   i_vfdcnt;       /* number of fd's vreading this inode */
        !            55:        short   i_hlink;        /* link in hash chain (iget/iput/ifind) */
        !            56: };
        !            57: 
        !            58: #ifdef KERNEL
        !            59: extern struct inode inode[];   /* The inode table itself */
        !            60: 
        !            61: struct inode *rootdir;         /* pointer to inode of root directory */
        !            62: struct inode *mpxip;           /* mpx virtual inode */
        !            63: 
        !            64: struct inode *ialloc();
        !            65: struct inode *ifind();
        !            66: struct inode *iget();
        !            67: struct inode *owner();
        !            68: struct inode *maknode();
        !            69: struct inode *namei();
        !            70: #endif
        !            71: 
        !            72: /* flags */
        !            73: #define        ILOCK   01              /* inode is locked */
        !            74: #define        IUPD    02              /* file has been modified */
        !            75: #define        IACC    04              /* inode access time to be updated */
        !            76: #define        IMOUNT  010             /* inode is mounted on */
        !            77: #define        IWANT   020             /* some process waiting on lock */
        !            78: #define        ITEXT   040             /* inode is pure text prototype */
        !            79: #define        ICHG    0100            /* inode has been changed */
        !            80: #define        IPIPE   0200            /* inode is a pipe */
        !            81: 
        !            82: /* modes */
        !            83: #define        IFMT    0170000         /* type of file */
        !            84: #define                IFDIR   0040000 /* directory */
        !            85: #define                IFCHR   0020000 /* character special */
        !            86: #define                IFBLK   0060000 /* block special */
        !            87: #define                IFREG   0100000 /* regular */
        !            88: #define                IFMPC   0030000 /* multiplexed char special */
        !            89: #define                IFMPB   0070000 /* multiplexed block special */
        !            90: #define        ISUID   04000           /* set user id on execution */
        !            91: #define        ISGID   02000           /* set group id on execution */
        !            92: #define        ISVTX   01000           /* save swapped text even after use */
        !            93: #define        IREAD   0400            /* read, write, execute permissions */
        !            94: #define        IWRITE  0200
        !            95: #define        IEXEC   0100

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