1 #ifndef __MFS_CONST_H__ 2 #define __MFS_CONST_H__ 3 4 /* Tables sizes */ 5 #define V2_NR_DZONES 7 /* # direct zone numbers in a V2 inode */ 6 #define V2_NR_TZONES 10 /* total # zone numbers in a V2 inode */ 7 8 #define NR_INODES 512 /* # slots in "in core" inode table, 9 * should be more or less the same as 10 * NR_VNODES in vfs 11 */ 12 13 #define INODE_HASH_LOG2 7 /* 2 based logarithm of the inode hash size */ 14 #define INODE_HASH_SIZE ((unsigned long)1<<INODE_HASH_LOG2) 15 #define INODE_HASH_MASK (((unsigned long)1<<INODE_HASH_LOG2)-1) 16 17 /* Max. filename length */ 18 #define MFS_NAME_MAX MFS_DIRSIZ 19 20 21 /* File system types. */ 22 #define SUPER_MAGIC 0x137F /* magic number contained in super-block */ 23 #define SUPER_REV 0x7F13 /* magic # when 68000 disk read on PC or vv */ 24 #define SUPER_V2 0x2468 /* magic # for V2 file systems */ 25 #define SUPER_V2_REV 0x6824 /* V2 magic written on PC, read on 68K or vv */ 26 #define SUPER_V3 0x4d5a /* magic # for V3 file systems */ 27 28 #define V2 2 /* version number of V2 file systems */ 29 #define V3 3 /* version number of V3 file systems */ 30 31 /* Miscellaneous constants */ 32 #define NO_BIT ((bit_t) 0) /* returned by alloc_bit() to signal failure */ 33 34 #define LOOK_UP 0 /* tells search_dir to lookup string */ 35 #define ENTER 1 /* tells search_dir to make dir entry */ 36 #define DELETE 2 /* tells search_dir to delete entry */ 37 #define IS_EMPTY 3 /* tells search_dir to ret. OK or ENOTEMPTY */ 38 39 /* write_map() args */ 40 #define WMAP_FREE (1 << 0) 41 42 #define IN_CLEAN 0 /* in-block inode and memory copies identical */ 43 #define IN_DIRTY 1 /* in-block inode and memory copies differ */ 44 #define ATIME 002 /* set if atime field needs updating */ 45 #define CTIME 004 /* set if ctime field needs updating */ 46 #define MTIME 010 /* set if mtime field needs updating */ 47 48 #define ROOT_INODE ((ino_t) 1) /* inode number for root directory */ 49 #define BOOT_BLOCK ((block_t) 0) /* block number of boot block */ 50 #define SUPER_BLOCK_BYTES (1024) /* bytes offset */ 51 #define START_BLOCK ((block_t) 2) /* first block of FS (not counting SB) */ 52 53 #define DIR_ENTRY_SIZE sizeof (struct direct) /* # bytes/dir entry */ 54 #define NR_DIR_ENTRIES(b) ((b)/DIR_ENTRY_SIZE) /* # dir entries/blk */ 55 #define SUPER_SIZE sizeof (struct super_block) /* super_block size */ 56 57 #define FS_BITMAP_CHUNKS(b) ((b)/sizeof (bitchunk_t))/* # map chunks/blk */ 58 #define FS_BITCHUNK_BITS (sizeof(bitchunk_t) * CHAR_BIT) 59 #define FS_BITS_PER_BLOCK(b) (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS) 60 61 /* Derived sizes pertaining to the V2 file system. */ 62 #define V2_ZONE_NUM_SIZE sizeof (zone_t) /* # bytes in V2 zone */ 63 #define V2_INODE_SIZE sizeof (d2_inode) /* bytes in V2 dsk ino */ 64 #define V2_INDIRECTS(b) ((b)/V2_ZONE_NUM_SIZE) /* # zones/indir block */ 65 #define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */ 66 67 #endif 68 69