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 50