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Annotation of xinu/h/iblock.h, revision 1.1

1.1     ! root        1: /* iblock.h - ibtodb, ibdisp */
        !             2: 
        !             3: typedef        int             IBADDR;         /* iblocks addressed 0,1,2,...  */
        !             4: 
        !             5: #define        IBLEN           29              /* # d-block ptrs in an i-block */
        !             6: #define        IBNULL          -1              /* null pointer in i-block list */
        !             7: #define        IBAREA          1               /* start if iblocks on disk     */
        !             8: #define        IBWDIR          TRUE            /* ibnew: write directory       */
        !             9: #define        IBNWDIR         FALSE           /* ibnew: don't write directory */
        !            10: 
        !            11: struct iblk            {               /* index block layout           */
        !            12:        long            ib_byte;        /* first data byte indexed by   */
        !            13:                                        /*  this index block            */
        !            14:        IBADDR          ib_next;        /* address of next i-block      */
        !            15:        DBADDR          ib_dba[IBLEN];  /* ptrs to data blocks indexed  */
        !            16: };
        !            17: 
        !            18: #define        ibtodb(ib)      (((ib)>>3)+IBAREA)/* iblock to disk block addr. */
        !            19: #define        ibdisp(ib)      (((ib)&07)*sizeof(struct iblk))

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