minix/usr.sbin/mkfs.mfs/v2/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 V2 inode */
   6 #define NR_TZONES      10       /* total # zone numbers in a V2 inode */
   7
   8 /* Blocks are of a fixed size */
   9 #define MFS_STATIC_BLOCK_SIZE   1024
  10
  11 #define SUPER_BLOCK_BYTES  MFS_STATIC_BLOCK_SIZE        /* 1 block */
  12
  13 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  14  * taking the sizes of small objects so that there are no surprises like
  15  * (small) long constants being passed to routines expecting an int.
  16  */
  17 #define usizeof(t) ((unsigned) sizeof(t))
  18
  19 /* File system types: magic number contained in super-block. */
  20 #define SUPER_V2        0x2468  /* magic # for V2 file systems */
  21 #define SUPER_MAGIC     SUPER_V2
  22
  23 /* Miscellaneous constants */
  24 #define SU_UID          ((uid_t) 0)     /* super_user's uid_t */
  25 #define SECTOR_SIZE     512
  26
  27 #define BOOT_BLOCK      ((block_t) 0)   /* block number of boot block */
  28 #define SUPER_BLOCK     ((block_t) 1)   /* block number of super block */
  29 #define START_BLOCK     ((block_t) 2)   /* first block of FS (not counting SB) */
  30
  31 #define ROOT_INODE      ((ino_t) 1)     /* inode number for root directory */
  32
  33 /* Derived sizes pertaining to the file system. */
  34 #define FS_BITMAP_CHUNKS(b) ((b)/usizeof (uint32_t))/* # map chunks/blk   */
  35 #define FS_BITCHUNK_BITS                (usizeof(uint32_t) * CHAR_BIT)
  36 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  37
  38 #define ZONE_NUM_SIZE           usizeof (zone_t)  /* # bytes in zone */
  39 #define INODE_SIZE              usizeof (struct inode)  /* bytes in dsk ino */
  40 #define INODES_PER_BLOCK(b)     ((b)/INODE_SIZE)  /* # V2 dsk inodes/blk */
  41 #define INDIRECTS(b)            ((b)/ZONE_NUM_SIZE)  /* # zones/indir block */
  42
  43 #define DIR_ENTRY_SIZE          usizeof(struct direct) /* # bytes/dir entry */
  44 #define NR_DIR_ENTRIES(b)       ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk  */
  45 #endif