servers/pfs/const.h

   1 #ifndef __PFS_CONST_H__
   2 #define __PFS_CONST_H__
   3
   4 #define NR_INODES        256    /* # slots in "in core" inode table */
   5
   6 #define INODE_HASH_LOG2   7     /* 2 based logarithm of the inode hash size */
   7 #define INODE_HASH_SIZE   ((unsigned long)1<<INODE_HASH_LOG2)
   8 #define INODE_HASH_MASK   (((unsigned long)1<<INODE_HASH_LOG2)-1)
   9
  10
  11 /* The type of sizeof may be (unsigned) long.  Use the following macro for
  12  * taking the sizes of small objects so that there are no surprises like
  13  * (small) long constants being passed to routines expecting an int.
  14  */
  15 #define usizeof(t) ((unsigned) sizeof(t))
  16
  17 /* Miscellaneous constants */
  18 #define INVAL_UID ((uid_t) -1)  /* Invalid user ID */
  19 #define INVAL_GID ((gid_t) -1)  /* Invalid group ID */
  20 #define NORMAL             0    /* forces get_block to do disk read */
  21 #define NO_READ            1    /* prevents get_block from doing disk read */
  22 #define PREFETCH           2    /* tells get_block not to read or mark dev */
  23
  24 #define NO_BIT   ((bit_t) 0)    /* returned by alloc_bit() to signal failure */
  25
  26 #define ATIME            002    /* set if atime field needs updating */
  27 #define CTIME            004    /* set if ctime field needs updating */
  28 #define MTIME            010    /* set if mtime field needs updating */
  29
  30 #define FS_BITMAP_CHUNKS(b) ((b)/usizeof (bitchunk_t))/* # map chunks/blk   */
  31 #define FS_BITCHUNK_BITS                (usizeof(bitchunk_t) * CHAR_BIT)
  32 #define FS_BITS_PER_BLOCK(b)    (FS_BITMAP_CHUNKS(b) * FS_BITCHUNK_BITS)
  33
  34 #endif
  35