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Annotation of 42BSD/etc/dump.4.1/include.4.1/sys/inode.h, revision 1.1

1.1     ! root        1: /*     inode.h 4.10    82/02/27        */
        !             2: 
        !             3: /*
        !             4:  * The I node is the focus of all file activity in UNIX.
        !             5:  * There is a unique inode allocated for each active file,
        !             6:  * each current directory, each mounted-on file, text file, and the root.
        !             7:  * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
        !             8:  * Data, from mode on, is read in from permanent inode on volume.
        !             9:  */
        !            10: #define        NADDR   13
        !            11: 
        !            12: struct inode {
        !            13:        char    i_flag;
        !            14:        char    i_count;        /* reference count */
        !            15:        dev_t   i_dev;          /* device where inode resides */
        !            16:        ino_t   i_number;       /* i number, 1-to-1 with device address */
        !            17: /* begin read from disk */
        !            18:        u_short i_mode;
        !            19:        short   i_nlink;        /* directory entries */
        !            20:        short   i_uid;          /* owner */
        !            21:        short   i_gid;          /* group of owner */
        !            22:        off_t   i_size;         /* size of file */
        !            23:        union {
        !            24:                struct i_f {
        !            25:                        daddr_t if_addr[NADDR]; /* if normal file/directory */
        !            26:                        daddr_t if_lastr;       /* last read (read-ahead) */
        !            27:                } i_f;
        !            28:                struct i_d {
        !            29:                        daddr_t id_rdev;        /* i_addr[0] */
        !            30:                } i_d;
        !            31:                struct i_s {
        !            32:                        struct  socket *is_socket;
        !            33:                } i_s;
        !            34: #define        i_addr          i_f.if_addr
        !            35: #define        i_lastr         i_f.if_lastr
        !            36: #define        i_rdev          i_d.id_rdev
        !            37: #define        i_socket        i_s.is_socket
        !            38:        } i_un;
        !            39: /* end read from disk */
        !            40:        short   i_XXXXXX;       /* ### */
        !            41: /* SHOULD USE POINTERS, NOT INDICES, FOR HAS CHAIN */
        !            42:        short   i_hlink;        /* link in hash chain (iget/iput/ifind) */
        !            43: };
        !            44: 
        !            45: #ifdef KERNEL
        !            46: struct inode *inode, *inodeNINODE;
        !            47: int    ninode;
        !            48: 
        !            49: struct inode *rootdir;         /* pointer to inode of root directory */
        !            50: 
        !            51: struct inode *ialloc();
        !            52: struct inode *ifind();
        !            53: struct inode *iget();
        !            54: struct inode *owner();
        !            55: struct inode *maknode();
        !            56: struct inode *namei();
        !            57: #endif
        !            58: 
        !            59: /* flags */
        !            60: #define        ILOCK   01              /* inode is locked */
        !            61: #define        IUPD    02              /* file has been modified */
        !            62: #define        IACC    04              /* inode access time to be updated */
        !            63: #define        IMOUNT  010             /* inode is mounted on */
        !            64: #define        IWANT   020             /* some process waiting on lock */
        !            65: #define        ITEXT   040             /* inode is pure text prototype */
        !            66: #define        ICHG    0100            /* inode has been changed */
        !            67: 
        !            68: /* modes */
        !            69: #define        IFMT    0170000         /* type of file */
        !            70: #define                IFCHR           0020000         /* character special */
        !            71: #define                IFDIR           0040000         /* directory */
        !            72: #define                IFBLK           0060000         /* block special */
        !            73: #define                IFREG           0100000         /* regular */
        !            74: #define                IFLNK           0120000         /* symbolic link */
        !            75: #define                IFPORTAL        0140000         /* portal */
        !            76: #define        ISUID   04000           /* set user id on execution */
        !            77: #define        ISGID   02000           /* set group id on execution */
        !            78: #define        ISVTX   01000           /* save swapped text even after use */
        !            79: #define        IREAD   0400            /* read, write, execute permissions */
        !            80: #define        IWRITE  0200
        !            81: #define        IEXEC   0100

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