FreeBSD/Linux Kernel Cross Reference
sys/servers/fs/const.h

     /* Tables sizes */
     #define V1_NR_DZONES       7    /* # direct zone numbers in a V1 inode */
     #define V1_NR_TZONES       9    /* total # zone numbers in a V1 inode */
     #define V2_NR_DZONES       7    /* # direct zone numbers in a V2 inode */
     #define V2_NR_TZONES      10    /* total # zone numbers in a V2 inode */
     
     #define NR_FILPS         128    /* # slots in filp table */
     #define NR_INODES         64    /* # slots in "in core" inode table */
     #define NR_SUPERS          8    /* # slots in super block table */
    #define NR_LOCKS           8    /* # slots in the file locking table */
    
    /* The type of sizeof may be (unsigned) long.  Use the following macro for
     * taking the sizes of small objects so that there are no surprises like
     * (small) long constants being passed to routines expecting an int.
     */
    #define usizeof(t) ((unsigned) sizeof(t))
    
    /* File system types. */
    #define SUPER_MAGIC   0x137F    /* magic number contained in super-block */
    #define SUPER_REV     0x7F13    /* magic # when 68000 disk read on PC or vv */
    #define SUPER_V2      0x2468    /* magic # for V2 file systems */
    #define SUPER_V2_REV  0x6824    /* V2 magic written on PC, read on 68K or vv */
    #define SUPER_V3      0x4d5a    /* magic # for V3 file systems */
    
    #define V1                 1    /* version number of V1 file systems */ 
    #define V2                 2    /* version number of V2 file systems */ 
    #define V3                 3    /* version number of V3 file systems */ 
    
    /* Miscellaneous constants */
    #define SU_UID   ((uid_t) 0)    /* super_user's uid_t */
    #define SYS_UID  ((uid_t) 0)    /* uid_t for processes MM and INIT */
    #define SYS_GID  ((gid_t) 0)    /* gid_t for processes MM and INIT */
    #define NORMAL             0    /* forces get_block to do disk read */
    #define NO_READ            1    /* prevents get_block from doing disk read */
    #define PREFETCH           2    /* tells get_block not to read or mark dev */
    
    #define XPIPE   (-NR_TASKS-1)   /* used in fp_task when susp'd on pipe */
    #define XLOCK   (-NR_TASKS-2)   /* used in fp_task when susp'd on lock */
    #define XPOPEN  (-NR_TASKS-3)   /* used in fp_task when susp'd on pipe open */
    #define XSELECT (-NR_TASKS-4)   /* used in fp_task when susp'd on select */
    
    #define NO_BIT   ((bit_t) 0)    /* returned by alloc_bit() to signal failure */
    
    #define DUP_MASK        0100    /* mask to distinguish dup2 from dup */
    
    #define LOOK_UP            0 /* tells search_dir to lookup string */
    #define ENTER              1 /* tells search_dir to make dir entry */
    #define DELETE             2 /* tells search_dir to delete entry */
    #define IS_EMPTY           3 /* tells search_dir to ret. OK or ENOTEMPTY */  
    
    #define CLEAN              0    /* disk and memory copies identical */
    #define DIRTY              1    /* disk and memory copies differ */
    #define ATIME            002    /* set if atime field needs updating */
    #define CTIME            004    /* set if ctime field needs updating */
    #define MTIME            010    /* set if mtime field needs updating */
    
    #define BYTE_SWAP          0    /* tells conv2/conv4 to swap bytes */
    
    #define END_OF_FILE   (-104)    /* eof detected */
    
    #define ROOT_INODE         1            /* inode number for root directory */
    #define BOOT_BLOCK  ((block_t) 0)       /* block number of boot block */
    #define SUPER_BLOCK_BYTES (1024)        /* bytes offset */
    #define START_BLOCK     2               /* first block of FS (not counting SB) */
    
    #define DIR_ENTRY_SIZE       usizeof (struct direct)  /* # bytes/dir entry   */
    #define NR_DIR_ENTRIES(b)   ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk   */
    #define SUPER_SIZE      usizeof (struct super_block)  /* super_block size    */
    #define PIPE_SIZE(b)          (V1_NR_DZONES*(b))  /* pipe size in bytes  */
    
    #define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk   */
    #define FS_BITCHUNK_BITS                (usizeof(bitchunk_t) * CHAR_BIT)
    #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
    
    /* Derived sizes pertaining to the V1 file system. */
    #define V1_ZONE_NUM_SIZE           usizeof (zone1_t)  /* # bytes in V1 zone  */
    #define V1_INODE_SIZE             usizeof (d1_inode)  /* bytes in V1 dsk ino */
    
    /* # zones/indir block */
    #define V1_INDIRECTS (STATIC_BLOCK_SIZE/V1_ZONE_NUM_SIZE)  
    
    /* # V1 dsk inodes/blk */
    #define V1_INODES_PER_BLOCK (STATIC_BLOCK_SIZE/V1_INODE_SIZE)
    
    /* Derived sizes pertaining to the V2 file system. */
    #define V2_ZONE_NUM_SIZE            usizeof (zone_t)  /* # bytes in V2 zone  */
    #define V2_INODE_SIZE             usizeof (d2_inode)  /* bytes in V2 dsk ino */
    #define V2_INDIRECTS(b)   ((b)/V2_ZONE_NUM_SIZE)  /* # zones/indir block */
    #define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */

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