50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
#ifndef _MKFS_MFS_CONST_H__
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#define _MKFS_MFS_CONST_H__
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/* Tables sizes */
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#define NR_DZONES 7 /* # direct zone numbers in a V1 inode */
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#define NR_TZONES 9 /* total # zone numbers in a V1 inode */
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/* V1 file systems are special in that zone numbers are only 16-bit */
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#define zone_t uint16_t
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/* Blocks are of a fixed size */
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#define MFS_STATIC_BLOCK_SIZE 1024
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#define SUPER_BLOCK_BYTES MFS_STATIC_BLOCK_SIZE /* 1 block */
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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: magic number contained in super-block. */
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#define SUPER_V1 0x137F /* magic # for V1 file systems */
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#define SUPER_MAGIC SUPER_V1
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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 SECTOR_SIZE 512
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#define BOOT_BLOCK ((block_t) 0) /* block number of boot block */
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#define SUPER_BLOCK ((block_t) 1) /* block number of super block */
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#define START_BLOCK ((block_t) 2) /* first block of FS (not counting SB) */
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#define ROOT_INODE ((ino_t) 1) /* inode number for root directory */
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/* Derived sizes pertaining to the file system. */
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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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#define ZONE_NUM_SIZE usizeof (zone_t) /* # bytes in zone */
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#define INODE_SIZE usizeof (struct inode) /* bytes in dsk ino */
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#define INODES_PER_BLOCK(b) ((b)/INODE_SIZE) /* # V2 dsk inodes/blk */
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#define INDIRECTS(b) ((b)/ZONE_NUM_SIZE) /* # zones/indir block */
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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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#endif
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