Minix1.1/usr/src/fs/const.h

/* Tables sizes */
#define NR_ZONE_NUMS       9	/* # zone numbers in an inode */
#define NR_BUFS           20	/* # blocks in the buffer cache */
#define NR_BUF_HASH       32	/* size of buf hash table; MUST BE POWER OF 2*/
#define NR_FDS            20	/* max file descriptors per process */
#define NR_FILPS          64	/* # slots in filp table */
#define I_MAP_SLOTS        4	/* max # of blocks in the inode bit map */
#define ZMAP_SLOTS         6	/* max # of blocks in the zone bit map */
#define NR_INODES         32	/* # slots in "in core" inode table */
#define NR_SUPERS          5	/* # slots in super block table */
#define NAME_SIZE         14	/* # bytes in a directory component */
#define FS_STACK_BYTES   512	/* size of file system stack */

/* Miscellaneous constants */
#define SUPER_MAGIC   0x137F	/* magic number contained in super-block */
#define SU_UID 	     (uid) 0	/* super_user's uid */
#define SYS_UID      (uid) 0	/* uid for processes MM and INIT */
#define SYS_GID      (gid) 0	/* gid for processes MM and INIT */
#define NORMAL	           0	/* forces get_block to do disk read */
#define NO_READ            1	/* prevents get_block from doing disk read */

#define XPIPE  	           0	/* used in fp_task when suspended on pipe */
#define NO_BIT    (bit_nr) 0	/* returned by alloc_bit() to signal failure */
#define DUP_MASK        0100	/* mask to distinguish dup2 from dup */

#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 CLEAN              0	/* disk and memory copies identical */
#define DIRTY              1	/* disk and memory copies differ */

#define BOOT_BLOCK (block_nr) 0	/* block number of boot block */
#define SUPER_BLOCK (block_nr)1	/* block number of super block */
#define ROOT_INODE (inode_nr) 1	/* inode number for root directory */

/* Derived sizes */
#define ZONE_NUM_SIZE    sizeof(zone_nr)		/* # bytes in zone nr*/
#define NR_DZONE_NUM     (NR_ZONE_NUMS-2)		/* # zones in inode */
#define DIR_ENTRY_SIZE   sizeof(dir_struct)		/* # bytes/dir entry */
#define INODES_PER_BLOCK (BLOCK_SIZE/INODE_SIZE)	/* # inodes/disk blk */
#define INODE_SIZE       (sizeof (d_inode))		/* bytes in disk inode*/
#define NR_DIR_ENTRIES   (BLOCK_SIZE/DIR_ENTRY_SIZE)	/* # dir entries/blk*/
#define NR_INDIRECTS     (BLOCK_SIZE/ZONE_NUM_SIZE)	/* # zones/indir blk */
#define INTS_PER_BLOCK   (BLOCK_SIZE/sizeof(int))	/* # integers/blk */
#define SUPER_SIZE       sizeof(struct super_block)	/* super_block size */
#define PIPE_SIZE        (NR_DZONE_NUM*BLOCK_SIZE)	/* pipe size in bytes*/
#define MAX_ZONES (NR_DZONE_NUM+NR_INDIRECTS+(long)NR_INDIRECTS*NR_INDIRECTS)
						/* max # of zones in a file */
#define printf printk