servers/mfs/const.h

   1 #ifndef __MFS_CONST_H__
   2 #define __MFS_CONST_H__
   3
   4 /* Tables sizes */
   5 #define V1_NR_DZONES       7    /* # direct zone numbers in a V1 inode */
   6 #define V1_NR_TZONES       9    /* total # zone numbers in a V1 inode */
   7 #define V2_NR_DZONES       7    /* # direct zone numbers in a V2 inode */
   8 #define V2_NR_TZONES      10    /* total # zone numbers in a V2 inode */
   9
  10 #define NR_INODES        256    /* # slots in "in core" inode table */
  11 #define GETDENTS_BUFSIZ  257
  12
  13 #define INODE_HASH_LOG2   7     /* 2 based logarithm of the inode hash size */
  14 #define INODE_HASH_SIZE   ((unsigned long)1<<INODE_HASH_LOG2)
  15 #define INODE_HASH_MASK   (((unsigned long)1<<INODE_HASH_LOG2)-1)
  16
  17
  18 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  19  * taking the sizes of small objects so that there are no surprises like
  20  * (small) long constants being passed to routines expecting an int.
  21  */
  22 #define usizeof(t) ((unsigned) sizeof(t))
  23
  24 /* File system types. */
  25 #define SUPER_MAGIC   0x137F    /* magic number contained in super-block */
  26 #define SUPER_REV     0x7F13    /* magic # when 68000 disk read on PC or vv */
  27 #define SUPER_V2      0x2468    /* magic # for V2 file systems */
  28 #define SUPER_V2_REV  0x6824    /* V2 magic written on PC, read on 68K or vv */
  29 #define SUPER_V3      0x4d5a    /* magic # for V3 file systems */
  30
  31 #define V1                 1    /* version number of V1 file systems */
  32 #define V2                 2    /* version number of V2 file systems */
  33 #define V3                 3    /* version number of V3 file systems */
  34
  35 /* Miscellaneous constants */
  36 #define SU_UID   ((uid_t) 0)    /* super_user's uid_t */
  37 #define NORMAL             0    /* forces get_block to do disk read */
  38 #define NO_READ            1    /* prevents get_block from doing disk read */
  39 #define PREFETCH           2    /* tells get_block not to read or mark dev */
  40
  41 #define NO_BIT   ((bit_t) 0)    /* returned by alloc_bit() to signal failure */
  42
  43 #define LOOK_UP            0 /* tells search_dir to lookup string */
  44 #define ENTER              1 /* tells search_dir to make dir entry */
  45 #define DELETE             2 /* tells search_dir to delete entry */
  46 #define IS_EMPTY           3 /* tells search_dir to ret. OK or ENOTEMPTY */
  47
  48 /* write_map() args */
  49 #define WMAP_FREE       (1 << 0)
  50
  51 #define IGN_PERM        0
  52 #define CHK_PERM        1
  53
  54 #define CLEAN              0    /* disk and memory copies identical */
  55 #define DIRTY              1    /* disk and memory copies differ */
  56 #define ATIME            002    /* set if atime field needs updating */
  57 #define CTIME            004    /* set if ctime field needs updating */
  58 #define MTIME            010    /* set if mtime field needs updating */
  59
  60 #define BYTE_SWAP          0    /* tells conv2/conv4 to swap bytes */
  61
  62 #define END_OF_FILE   (-104)    /* eof detected */
  63
  64 #define ROOT_INODE    ((ino_t) 1)       /* inode number for root directory */
  65 #define BOOT_BLOCK  ((block_t) 0)       /* block number of boot block */
  66 #define SUPER_BLOCK_BYTES  (1024)       /* bytes offset */
  67 #define START_BLOCK ((block_t) 2)       /* first block of FS (not counting SB) */
  68
  69 #define DIR_ENTRY_SIZE       usizeof (struct direct)  /* # bytes/dir entry   */
  70 #define NR_DIR_ENTRIES(b)   ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk   */
  71 #define SUPER_SIZE      usizeof (struct super_block)  /* super_block size    */
  72
  73 #define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk   */
  74 #define FS_BITCHUNK_BITS                (usizeof(bitchunk_t) * CHAR_BIT)
  75 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  76
  77 /* Derived sizes pertaining to the V1 file system. */
  78 #define V1_ZONE_NUM_SIZE           usizeof (zone1_t)  /* # bytes in V1 zone  */
  79 #define V1_INODE_SIZE             usizeof (d1_inode)  /* bytes in V1 dsk ino */
  80
  81 /* # zones/indir block */
  82 #define V1_INDIRECTS (_STATIC_BLOCK_SIZE/V1_ZONE_NUM_SIZE)
  83
  84 /* # V1 dsk inodes/blk */
  85 #define V1_INODES_PER_BLOCK (_STATIC_BLOCK_SIZE/V1_INODE_SIZE)
  86
  87 /* Derived sizes pertaining to the V2 file system. */
  88 #define V2_ZONE_NUM_SIZE            usizeof (zone_t)  /* # bytes in V2 zone  */
  89 #define V2_INODE_SIZE             usizeof (d2_inode)  /* bytes in V2 dsk ino */
  90 #define V2_INDIRECTS(b)   ((b)/V2_ZONE_NUM_SIZE)  /* # zones/indir block */
  91 #define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */
  92
  93 #define NUL(str,l,m) mfs_nul_f(__FILE__,__LINE__,(str), (l), (m))
  94
  95 /* Args to dev_bio/dev_io */
  96 #define MFS_DEV_READ    10001
  97 #define MFS_DEV_WRITE   10002
  98 #define MFS_DEV_SCATTER 10003
  99 #define MFS_DEV_GATHER  10004
 100
 101 #endif
 102