servers/vfs/const.h

   1 /* Tables sizes */
   2 #define V1_NR_DZONES       7    /* # direct zone numbers in a V1 inode */
   3 #define V1_NR_TZONES       9    /* total # zone numbers in a V1 inode */
   4 #define V2_NR_DZONES       7    /* # direct zone numbers in a V2 inode */
   5 #define V2_NR_TZONES      10    /* total # zone numbers in a V2 inode */
   6
   7 #define NR_FILPS         512    /* # slots in filp table */
   8 #define NR_INODES        256    /* # slots in "in core" inode table */
   9 #define NR_SUPERS         12    /* # slots in super block table */
  10 #define NR_LOCKS           8    /* # slots in the file locking table */
  11
  12
  13 #define NR_MNTS             8
  14 #define NR_VNODES         512
  15
  16
  17 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  18  * taking the sizes of small objects so that there are no surprises like
  19  * (small) long constants being passed to routines expecting an int.
  20  */
  21 #define usizeof(t) ((unsigned) sizeof(t))
  22
  23 /* File system types. */
  24 #define SUPER_MAGIC   0x137F    /* magic number contained in super-block */
  25 #define SUPER_REV     0x7F13    /* magic # when 68000 disk read on PC or vv */
  26 #define SUPER_V2      0x2468    /* magic # for V2 file systems */
  27 #define SUPER_V2_REV  0x6824    /* V2 magic written on PC, read on 68K or vv */
  28 #define SUPER_V3      0x4d5a    /* magic # for V3 file systems */
  29
  30 #define V1                 1    /* version number of V1 file systems */
  31 #define V2                 2    /* version number of V2 file systems */
  32 #define V3                 3    /* version number of V3 file systems */
  33
  34 /* Miscellaneous constants */
  35 #define SU_UID   ((uid_t) 0)    /* super_user's uid_t */
  36 #define SERVERS_UID ((uid_t) 11) /* who may do FSSIGNON */
  37 #define SYS_UID  ((uid_t) 0)    /* uid_t for processes MM and INIT */
  38 #define SYS_GID  ((gid_t) 0)    /* gid_t for processes MM and INIT */
  39 #define NORMAL             0    /* forces get_block to do disk read */
  40 #define NO_READ            1    /* prevents get_block from doing disk read */
  41 #define PREFETCH           2    /* tells get_block not to read or mark dev */
  42
  43 #define XPIPE   (-NR_TASKS-1)   /* used in fp_task when susp'd on pipe */
  44 #define XLOCK   (-NR_TASKS-2)   /* used in fp_task when susp'd on lock */
  45 #define XPOPEN  (-NR_TASKS-3)   /* used in fp_task when susp'd on pipe open */
  46 #define XSELECT (-NR_TASKS-4)   /* used in fp_task when susp'd on select */
  47
  48 #define NO_BIT   ((bit_t) 0)    /* returned by alloc_bit() to signal failure */
  49
  50 #define DUP_MASK        0100    /* mask to distinguish dup2 from dup */
  51
  52 #define LOOK_UP            0 /* tells search_dir to lookup string */
  53 #define ENTER              1 /* tells search_dir to make dir entry */
  54 #define DELETE             2 /* tells search_dir to delete entry */
  55 #define IS_EMPTY           3 /* tells search_dir to ret. OK or ENOTEMPTY */
  56
  57 /* write_map() args */
  58 #define WMAP_FREE       (1 << 0)
  59
  60 #define PATH_TRANSPARENT 000   /* parse_path stops at final object */
  61 #define PATH_PENULTIMATE 001   /* parse_path stops at last but one name */
  62 #define PATH_OPAQUE      002   /* parse_path stops at final name */
  63 #define PATH_NONSYMBOLIC 004   /* parse_path scans final name if symbolic */
  64 #define PATH_STRIPDOT    010   /* parse_path strips /. from path */
  65 #define EAT_PATH         PATH_TRANSPARENT
  66 #define EAT_PATH_OPAQUE  PATH_OPAQUE
  67 #define LAST_DIR         PATH_PENULTIMATE
  68 #define LAST_DIR_NOTDOT  PATH_PENULTIMATE | PATH_STRIPDOT
  69 #define LAST_DIR_EATSYM  PATH_NONSYMBOLIC
  70 #define SYMLOOP         16
  71
  72 #define CLEAN              0    /* disk and memory copies identical */
  73 #define DIRTY              1    /* disk and memory copies differ */
  74 #define ATIME            002    /* set if atime field needs updating */
  75 #define CTIME            004    /* set if ctime field needs updating */
  76 #define MTIME            010    /* set if mtime field needs updating */
  77
  78 #define BYTE_SWAP          0    /* tells conv2/conv4 to swap bytes */
  79
  80 #define END_OF_FILE   (-104)    /* eof detected */
  81
  82 #define ROOT_INODE         1            /* inode number for root directory */
  83 #define BOOT_BLOCK  ((block_t) 0)       /* block number of boot block */
  84 #define SUPER_BLOCK_BYTES (1024)        /* bytes offset */
  85 #define START_BLOCK     2               /* first block of FS (not counting SB) */
  86
  87 #define DIR_ENTRY_SIZE       usizeof (struct direct)  /* # bytes/dir entry   */
  88 #define NR_DIR_ENTRIES(b)   ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk   */
  89 #define SUPER_SIZE      usizeof (struct super_block)  /* super_block size    */
  90 #define PIPE_SIZE(b)          (V1_NR_DZONES*(b))  /* pipe size in bytes  */
  91
  92 #define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk   */
  93 #define FS_BITCHUNK_BITS                (usizeof(bitchunk_t) * CHAR_BIT)
  94 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  95
  96 /* Derived sizes pertaining to the V1 file system. */
  97 #define V1_ZONE_NUM_SIZE           usizeof (zone1_t)  /* # bytes in V1 zone  */
  98 #define V1_INODE_SIZE             usizeof (d1_inode)  /* bytes in V1 dsk ino */
  99
 100 /* # zones/indir block */
 101 #define V1_INDIRECTS (_STATIC_BLOCK_SIZE/V1_ZONE_NUM_SIZE)
 102
 103 /* # V1 dsk inodes/blk */
 104 #define V1_INODES_PER_BLOCK (_STATIC_BLOCK_SIZE/V1_INODE_SIZE)
 105
 106 /* Derived sizes pertaining to the V2 file system. */
 107 #define V2_ZONE_NUM_SIZE            usizeof (zone_t)  /* # bytes in V2 zone  */
 108 #define V2_INODE_SIZE             usizeof (d2_inode)  /* bytes in V2 dsk ino */
 109 #define V2_INDIRECTS(b)   ((b)/V2_ZONE_NUM_SIZE)  /* # zones/indir block */
 110 #define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */
 111
 112 /* Args to dev_bio/dev_io */
 113 #define VFS_DEV_READ    2001
 114 #define VFS_DEV_WRITE   2002
 115 #define VFS_DEV_SCATTER 2003
 116 #define VFS_DEV_GATHER  2004
 117 #define VFS_DEV_IOCTL   2005
 118 #define VFS_DEV_SELECT  2006