minix/usr.sbin/mkfs.mfs/v3/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 #define MIN_BLOCK_SIZE          1024
   9 #define DEFAULT_BLOCK_SIZE      4096
  10
  11 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  12  * taking the sizes of small objects so that there are no surprises like
  13  * (small) long constants being passed to routines expecting an int.
  14  */
  15 #define usizeof(t) ((unsigned) sizeof(t))
  16
  17 /* File system types: magic number contained in super-block. */
  18 #define SUPER_V3      0x4d5a    /* magic # for V3 file systems */
  19 #define SUPER_MAGIC     SUPER_V3
  20
  21 /* Miscellaneous constants */
  22 #define SU_UID           ((uid_t) 0)    /* super_user's uid_t */
  23 #define SECTOR_SIZE     512
  24
  25 #define ROOT_INODE      ((ino_t) 1)     /* inode number for root directory */
  26
  27 #define BOOT_BLOCK      ((blkcnt_t) 0)  /* block number of boot block */
  28 #define SUPER_BLOCK_BYTES  (1024)       /* bytes offset */
  29 #define START_BLOCK     ((blkcnt_t) 2)  /* first block of FS (not counting SB) */
  30
  31 #define FS_BITMAP_CHUNKS(b)     ((b)/usizeof(bitchunk_t)) /*# map chunks/blk*/
  32 #define FS_BITCHUNK_BITS        (usizeof(bitchunk_t) * CHAR_BIT)
  33 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  34
  35 /* Derived sizes pertaining to the file system. */
  36 #define ZONE_NUM_SIZE           usizeof (zone_t)  /* # bytes in zone */
  37 #define INODE_SIZE              usizeof (struct inode)  /* bytes in dsk ino */
  38 #define INDIRECTS(b)            ((b)/ZONE_NUM_SIZE)  /* # zones/indir block */
  39 #define INODES_PER_BLOCK(b)     ((b)/INODE_SIZE)  /* # V2 dsk inodes/blk */
  40
  41 #define DIR_ENTRY_SIZE          usizeof(struct direct) /* # bytes/dir entry */
  42 #define NR_DIR_ENTRIES(b)       ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk  */
  43 #endif