86 lines
3.5 KiB
C
86 lines
3.5 KiB
C
#ifndef __MFS_CONST_H__
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#define __MFS_CONST_H__
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/* Tables sizes */
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#define V2_NR_DZONES 7 /* # direct zone numbers in a V2 inode */
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#define V2_NR_TZONES 10 /* total # zone numbers in a V2 inode */
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#define NR_INODES 512 /* # slots in "in core" inode table,
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* should be more or less the same as
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* NR_VNODES in vfs
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*/
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#define INODE_HASH_LOG2 7 /* 2 based logarithm of the inode hash size */
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#define INODE_HASH_SIZE ((unsigned long)1<<INODE_HASH_LOG2)
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#define INODE_HASH_MASK (((unsigned long)1<<INODE_HASH_LOG2)-1)
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/* Max. filename length */
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#define MFS_NAME_MAX MFS_DIRSIZ
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/* The type of sizeof may be (unsigned) long. Use the following macro for
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* taking the sizes of small objects so that there are no surprises like
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* (small) long constants being passed to routines expecting an int.
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*/
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#define usizeof(t) ((unsigned) sizeof(t))
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/* File system types. */
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#define SUPER_MAGIC 0x137F /* magic number contained in super-block */
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#define SUPER_REV 0x7F13 /* magic # when 68000 disk read on PC or vv */
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#define SUPER_V2 0x2468 /* magic # for V2 file systems */
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#define SUPER_V2_REV 0x6824 /* V2 magic written on PC, read on 68K or vv */
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#define SUPER_V3 0x4d5a /* magic # for V3 file systems */
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#define V2 2 /* version number of V2 file systems */
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#define V3 3 /* version number of V3 file systems */
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/* Miscellaneous constants */
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#define SU_UID ((uid_t) 0) /* super_user's uid_t */
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#define NO_BIT ((bit_t) 0) /* returned by alloc_bit() to signal failure */
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#define LOOK_UP 0 /* tells search_dir to lookup string */
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#define ENTER 1 /* tells search_dir to make dir entry */
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#define DELETE 2 /* tells search_dir to delete entry */
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#define IS_EMPTY 3 /* tells search_dir to ret. OK or ENOTEMPTY */
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/* write_map() args */
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#define WMAP_FREE (1 << 0)
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#define IGN_PERM 0
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#define CHK_PERM 1
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#define IN_CLEAN 0 /* in-block inode and memory copies identical */
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#define IN_DIRTY 1 /* in-block inode and memory copies differ */
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#define ATIME 002 /* set if atime field needs updating */
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#define CTIME 004 /* set if ctime field needs updating */
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#define MTIME 010 /* set if mtime field needs updating */
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#define BYTE_SWAP 0 /* tells conv2/conv4 to swap bytes */
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#define END_OF_FILE (-104) /* eof detected */
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#define ROOT_INODE ((ino_t) 1) /* inode number for root directory */
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#define BOOT_BLOCK ((block_t) 0) /* block number of boot block */
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#define SUPER_BLOCK_BYTES (1024) /* bytes offset */
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#define START_BLOCK ((block_t) 2) /* first block of FS (not counting SB) */
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#define DIR_ENTRY_SIZE usizeof (struct direct) /* # bytes/dir entry */
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#define NR_DIR_ENTRIES(b) ((b)/DIR_ENTRY_SIZE) /* # dir entries/blk */
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#define SUPER_SIZE usizeof (struct super_block) /* super_block size */
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#define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk */
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#define FS_BITCHUNK_BITS (usizeof(bitchunk_t) * CHAR_BIT)
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#define FS_BITS_PER_BLOCK(b) (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
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/* Derived sizes pertaining to the V2 file system. */
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#define V2_ZONE_NUM_SIZE usizeof (zone_t) /* # bytes in V2 zone */
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#define V2_INODE_SIZE usizeof (d2_inode) /* bytes in V2 dsk ino */
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#define V2_INDIRECTS(b) ((b)/V2_ZONE_NUM_SIZE) /* # zones/indir block */
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#define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */
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#define NUL(str,l,m) mfs_nul_f(__FILE__,__LINE__,(str), (l), (m))
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#endif
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