include/minix/dirent.h

   1 /*      dirent.h - Declarations for directory reading routines.
   2  *                                                      Author: Kees J. Bot
   3  *                                                              24 Apr 1989
   4  *
   5  * Note: The V7 format directory entries used under Minix must be transformed
   6  * into a struct dirent with a d_name of at least 15 characters.  Given that
   7  * we have to transform V7 entries anyhow it is little trouble to let the
   8  * routines understand the so-called "flex" directory format too.
   9  */
  10
  11 #ifndef _DIRENT_H
  12 #define _DIRENT_H
  13
  14 #include <sys/cdefs.h>
  15
  16         /* Name of length len needs _EXTENT(len) extra slots. */
  17 #define _EXTENT(len)    (((len) + 5) >> 3)
  18
  19 /* The block size must be at least 1024 bytes, because otherwise
  20  * the superblock (at 1024 bytes) overlaps with other filesystem data.
  21  */
  22 #define _MIN_BLOCK_SIZE          1024
  23
  24 /* The below is allocated in some parts of the system as the largest
  25  * a filesystem block can be. For instance, the boot monitor allocates
  26  * 3 of these blocks and has to fit within 64kB, so this can't be
  27  * increased without taking that into account.
  28  */
  29 #define _MAX_BLOCK_SIZE          4096
  30
  31 /* This is the block size for the fixed versions of the filesystem (V1/V2) */
  32 #define _STATIC_BLOCK_SIZE      1024
  33
  34 #endif /* _DIRENT_H */