84 lines
4.3 KiB
C
84 lines
4.3 KiB
C
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/* Tables sizes */
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#define V1_NR_DZONES 7 /* # direct zone numbers in a V1 inode */
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#define V1_NR_TZONES 9 /* total # zone numbers in a V1 inode */
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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_FILPS 128 /* # slots in filp table */
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#define NR_INODES 64 /* # slots in "in core" inode table */
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#define NR_SUPERS 8 /* # slots in super block table */
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#define NR_LOCKS 8 /* # slots in the file locking table */
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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 V1 1 /* version number of V1 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 SYS_UID ((uid_t) 0) /* uid_t for processes MM and INIT */
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#define SYS_GID ((gid_t) 0) /* gid_t for processes MM and INIT */
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#define NORMAL 0 /* forces get_block to do disk read */
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#define NO_READ 1 /* prevents get_block from doing disk read */
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#define PREFETCH 2 /* tells get_block not to read or mark dev */
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#define XPIPE (-NR_TASKS-1) /* used in fp_task when susp'd on pipe */
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#define XLOCK (-NR_TASKS-2) /* used in fp_task when susp'd on lock */
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#define XPOPEN (-NR_TASKS-3) /* used in fp_task when susp'd on pipe open */
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#define NO_BIT ((bit_t) 0) /* returned by alloc_bit() to signal failure */
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#define DUP_MASK 0100 /* mask to distinguish dup2 from dup */
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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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#define CLEAN 0 /* disk and memory copies identical */
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#define DIRTY 1 /* disk 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 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 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 PIPE_SIZE(b) (V1_NR_DZONES*(b)) /* pipe size in bytes */
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#define BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk */
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#define BITCHUNK_BITS (usizeof(bitchunk_t) * CHAR_BIT)
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#define BITS_PER_BLOCK(b) (BITMAP_CHUNKS(b) * BITCHUNK_BITS)
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/* Derived sizes pertaining to the V1 file system. */
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#define V1_ZONE_NUM_SIZE usizeof (zone1_t) /* # bytes in V1 zone */
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#define V1_INODE_SIZE usizeof (d1_inode) /* bytes in V1 dsk ino */
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#define V1_INDIRECTS (STATIC_BLOCK_SIZE/V1_ZONE_NUM_SIZE) /* # zones/indir block */
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#define V1_INODES_PER_BLOCK (STATIC_BLOCK_SIZE/V1_INODE_SIZE)/* # V1 dsk inodes/blk */
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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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