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 46