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Annotation of xinu/h/iblock.h, revision 1.1.1.1

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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