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#ifndef __MFS_CONST_H__
#define __MFS_CONST_H__
/* Tables sizes */
#define V2_NR_DZONES 7 /* # direct zone numbers in a V2 inode */
#define V2_NR_TZONES 10 /* total # zone numbers in a V2 inode */
#define NR_INODES 512 /* # slots in "in core" inode table,
* should be more or less the same as
* NR_VNODES in vfs
*/
#define INODE_HASH_LOG2 7 /* 2 based logarithm of the inode hash size */
#define INODE_HASH_SIZE ((unsigned long)1<<INODE_HASH_LOG2)
#define INODE_HASH_MASK (((unsigned long)1<<INODE_HASH_LOG2)-1)
/* Max. filename length */
#define MFS_NAME_MAX MFS_DIRSIZ
/* File system types. */
#define SUPER_MAGIC 0x137F /* magic number contained in super-block */
#define SUPER_REV 0x7F13 /* magic # when 68000 disk read on PC or vv */
#define SUPER_V2 0x2468 /* magic # for V2 file systems */
#define SUPER_V2_REV 0x6824 /* V2 magic written on PC, read on 68K or vv */
#define SUPER_V3 0x4d5a /* magic # for V3 file systems */
#define V2 2 /* version number of V2 file systems */
#define V3 3 /* version number of V3 file systems */
/* Miscellaneous constants */
#define NO_BIT ((bit_t) 0) /* returned by alloc_bit() to signal failure */
#define LOOK_UP 0 /* tells search_dir to lookup string */
#define ENTER 1 /* tells search_dir to make dir entry */
#define DELETE 2 /* tells search_dir to delete entry */
#define IS_EMPTY 3 /* tells search_dir to ret. OK or ENOTEMPTY */
/* write_map() args */
#define WMAP_FREE (1 << 0)
#define IN_CLEAN 0 /* in-block inode and memory copies identical */
#define IN_DIRTY 1 /* in-block inode and memory copies differ */
#define ATIME 002 /* set if atime field needs updating */
#define CTIME 004 /* set if ctime field needs updating */
#define MTIME 010 /* set if mtime field needs updating */
#define ROOT_INODE ((ino_t) 1) /* inode number for root directory */
#define BOOT_BLOCK ((block_t) 0) /* block number of boot block */
#define SUPER_BLOCK_BYTES (1024) /* bytes offset */
#define START_BLOCK ((block_t) 2) /* first block of FS (not counting SB) */
#define DIR_ENTRY_SIZE sizeof (struct direct) /* # bytes/dir entry */
#define NR_DIR_ENTRIES(b) ((b)/DIR_ENTRY_SIZE) /* # dir entries/blk */
#define SUPER_SIZE sizeof (struct super_block) /* super_block size */
#define FS_BITMAP_CHUNKS(b) ((b)/sizeof (bitchunk_t))/* # map chunks/blk */
#define FS_BITCHUNK_BITS (sizeof(bitchunk_t) * CHAR_BIT)
#define FS_BITS_PER_BLOCK(b) (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
/* Derived sizes pertaining to the V2 file system. */
#define V2_ZONE_NUM_SIZE sizeof (zone_t) /* # bytes in V2 zone */
#define V2_INODE_SIZE sizeof (d2_inode) /* bytes in V2 dsk ino */
#define V2_INDIRECTS(b) ((b)/V2_ZONE_NUM_SIZE) /* # zones/indir block */
#define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */
#endif
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