minix/usr.sbin/mkfs.mfs/v1/const.h

   1 #ifndef _MKFS_MFS_CONST_H__
   2 #define _MKFS_MFS_CONST_H__
   3
   4 /* Tables sizes */
   5 #define NR_DZONES       7       /* # direct zone numbers in a V1 inode */
   6 #define NR_TZONES       9       /* total # zone numbers in a V1 inode */
   7
   8 /* V1 file systems are special in that zone numbers are only 16-bit */
   9 #define zone_t          uint16_t
  10
  11 /* Blocks are of a fixed size */
  12 #define MFS_STATIC_BLOCK_SIZE   1024
  13
  14 #define SUPER_BLOCK_BYTES  MFS_STATIC_BLOCK_SIZE        /* 1 block */
  15
  16 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  17  * taking the sizes of small objects so that there are no surprises like
  18  * (small) long constants being passed to routines expecting an int.
  19  */
  20 #define usizeof(t) ((unsigned) sizeof(t))
  21
  22 /* File system types: magic number contained in super-block. */
  23 #define SUPER_V1        0x137F  /* magic # for V1 file systems */
  24 #define SUPER_MAGIC     SUPER_V1
  25
  26 /* Miscellaneous constants */
  27 #define SU_UID          ((uid_t) 0)     /* super_user's uid_t */
  28 #define SECTOR_SIZE     512
  29
  30 #define BOOT_BLOCK      ((block_t) 0)   /* block number of boot block */
  31 #define SUPER_BLOCK     ((block_t) 1)   /* block number of super block */
  32 #define START_BLOCK     ((block_t) 2)   /* first block of FS (not counting SB) */
  33
  34 #define ROOT_INODE      ((ino_t) 1)     /* inode number for root directory */
  35
  36 /* Derived sizes pertaining to the file system. */
  37 #define FS_BITMAP_CHUNKS(b)     ((b)/usizeof(bitchunk_t)) /*# map chunks/blk*/
  38 #define FS_BITCHUNK_BITS        (usizeof(bitchunk_t) * CHAR_BIT)
  39 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  40
  41 #define ZONE_NUM_SIZE           usizeof (zone_t)  /* # bytes in zone */
  42 #define INODE_SIZE              usizeof (struct inode)  /* bytes in dsk ino */
  43 #define INODES_PER_BLOCK(b)     ((b)/INODE_SIZE)  /* # V2 dsk inodes/blk */
  44 #define INDIRECTS(b)            ((b)/ZONE_NUM_SIZE)  /* # zones/indir block */
  45
  46 #define DIR_ENTRY_SIZE          usizeof(struct direct) /* # bytes/dir entry */
  47 #define NR_DIR_ENTRIES(b)       ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk  */
  48
  49 #endif