include/linux/efs_dir.h

   1 /*
   2  * efs_dir.h
   3  *
   4  * Copyright (c) 1999 Al Smith
   5  */
   6
   7 #ifndef __EFS_DIR_H__
   8 #define __EFS_DIR_H__
   9
  10 #define EFS_DIRBSIZE_BITS       EFS_BLOCKSIZE_BITS
  11 #define EFS_DIRBSIZE            (1 << EFS_DIRBSIZE_BITS)
  12
  13 struct efs_dentry {
  14         unsigned int    inode;
  15         unsigned char   namelen;
  16         char            name[3];
  17 };
  18
  19 #define EFS_DENTSIZE    (sizeof(struct efs_dentry) - 3 + 1)
  20 #define EFS_MAXNAMELEN  ((1 << (sizeof(char) * 8)) - 1)
  21
  22 #define EFS_DIRBLK_HEADERSIZE   4
  23 #define EFS_DIRBLK_MAGIC        0xbeef  /* moo */
  24
  25 struct efs_dir {
  26         unsigned short  magic;
  27         unsigned char   firstused;
  28         unsigned char   slots;
  29
  30         unsigned char   space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
  31 };
  32
  33 #define EFS_MAXENTS \
  34         ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
  35          (EFS_DENTSIZE + sizeof(char)))
  36
  37 #define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
  38
  39 #define EFS_REALOFF(offset) ((offset << 1))
  40
  41 #endif /* __EFS_DIR_H__ */
  42