usr.sbin/mkfs.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        512    /* # slots in "in core" inode table,
  11                                  * should be more or less the same as
  12                                  * NR_VNODES in vfs
  13                                  */
  14 #define GETDENTS_BUFSIZ  257
  15
  16 #define INODE_HASH_LOG2   7     /* 2 based logarithm of the inode hash size */
  17 #define INODE_HASH_SIZE   ((unsigned long)1<<INODE_HASH_LOG2)
  18 #define INODE_HASH_MASK   (((unsigned long)1<<INODE_HASH_LOG2)-1)
  19
  20 /* Max. filename length */
  21 #define MFS_NAME_MAX     MFS_DIRSIZ
  22
  23
  24 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  25  * taking the sizes of small objects so that there are no surprises like
  26  * (small) long constants being passed to routines expecting an int.
  27  */
  28 #define usizeof(t) ((unsigned) sizeof(t))
  29
  30 /* File system types. */
  31 #define SUPER_MAGIC   0x137F    /* magic number contained in super-block */
  32 #define SUPER_REV     0x7F13    /* magic # when 68000 disk read on PC or vv */
  33 #define SUPER_V2      0x2468    /* magic # for V2 file systems */
  34 #define SUPER_V2_REV  0x6824    /* V2 magic written on PC, read on 68K or vv */
  35 #define SUPER_V3      0x4d5a    /* magic # for V3 file systems */
  36
  37 #define V1                 1    /* version number of V1 file systems */
  38 #define V2                 2    /* version number of V2 file systems */
  39 #define V3                 3    /* version number of V3 file systems */
  40
  41 /* Miscellaneous constants */
  42 #define SU_UID   ((uid_t) 0)    /* super_user's uid_t */
  43 #define NORMAL             0    /* forces get_block to do disk read */
  44 #define NO_READ            1    /* prevents get_block from doing disk read */
  45 #define PREFETCH           2    /* tells get_block not to read or mark dev */
  46
  47 #define NO_BIT   ((uint32_t) 0) /* returned by alloc_bit() to signal failure */
  48
  49 #define LOOK_UP            0 /* tells search_dir to lookup string */
  50 #define ENTER              1 /* tells search_dir to make dir entry */
  51 #define DELETE             2 /* tells search_dir to delete entry */
  52 #define IS_EMPTY           3 /* tells search_dir to ret. OK or ENOTEMPTY */
  53
  54 /* write_map() args */
  55 #define WMAP_FREE       (1 << 0)
  56
  57 #define IGN_PERM        0
  58 #define CHK_PERM        1
  59
  60 #define BP_CLEAN        0       /* on-disk block and memory copies identical */
  61 #define BP_DIRTY        1       /* on-disk block and memory copies differ */
  62 #define IN_CLEAN        0       /* in-block inode and memory copies identical */
  63 #define IN_DIRTY        1       /* in-block inode and memory copies differ */
  64 #define ATIME            002    /* set if atime field needs updating */
  65 #define CTIME            004    /* set if ctime field needs updating */
  66 #define MTIME            010    /* set if mtime field needs updating */
  67
  68 #define BYTE_SWAP          0    /* tells conv2/conv4 to swap bytes */
  69
  70 #define END_OF_FILE   (-104)    /* eof detected */
  71
  72 #define ROOT_INODE    ((ino_t) 1)       /* inode number for root directory */
  73 #define BOOT_BLOCK  ((blkcnt_t) 0)      /* block number of boot block */
  74 #define SUPER_BLOCK_BYTES  (1024)       /* bytes offset */
  75 #define START_BLOCK ((blkcnt_t) 2)      /* first block of FS (not counting SB) */
  76
  77 #define DIR_ENTRY_SIZE       usizeof (struct direct)  /* # bytes/dir entry   */
  78 #define NR_DIR_ENTRIES(b)   ((b)/DIR_ENTRY_SIZE)  /* # dir entries/blk   */
  79 #define SUPER_SIZE      usizeof (struct super_block)  /* super_block size    */
  80
  81 #define FS_BITMAP_CHUNKS(b) ((b)/usizeof (uint32_t))/* # map chunks/blk   */
  82 #define FS_BITCHUNK_BITS                (usizeof(uint32_t) * CHAR_BIT)
  83 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  84
  85 /* Derived sizes pertaining to the V1 file system. */
  86 #define V1_ZONE_NUM_SIZE           usizeof (uint16_t)  /* # bytes in V1 zone  */
  87 #define V1_INODE_SIZE             usizeof (d1_inode)  /* bytes in V1 dsk ino */
  88
  89 /* # zones/indir block */
  90 #define V1_INDIRECTS (_STATIC_BLOCK_SIZE/V1_ZONE_NUM_SIZE)
  91
  92 /* # V1 dsk inodes/blk */
  93 #define V1_INODES_PER_BLOCK (_STATIC_BLOCK_SIZE/V1_INODE_SIZE)
  94
  95 /* Derived sizes pertaining to the V2 file system. */
  96 #define V2_ZONE_NUM_SIZE            usizeof (uint32_t)  /* # bytes in V2 zone  */
  97 #define V2_INODE_SIZE             usizeof (d2_inode)  /* bytes in V2 dsk ino */
  98 #define V2_INDIRECTS(b)   ((b)/V2_ZONE_NUM_SIZE)  /* # zones/indir block */
  99 #define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */
 100
 101 #define NUL(str,l,m) mfs_nul_f(__FILE__,__LINE__,(str), (l), (m))
 102
 103 #define _STATIC_BLOCK_SIZE      1024
 104 #define _MIN_BLOCK_SIZE          1024
 105 #define _MAX_BLOCK_SIZE          4096
 106 #endif
 107