boot/rawfs.h

   1 /*      rawfs.h - Raw Minix file system support.        Author: Kees J. Bot
   2  *
   3  *              off_t r_super(int *block_size);
   4  *                      Initialize variables, returns the size of a valid Minix
   5  *                      file system blocks, but zero on error.
   6  *
   7  *              void r_stat(ino_t file, struct stat *stp);
   8  *                      Return information about a file like stat(2) and
   9  *                      remembers file for the next two calls.
  10  *
  11  *              off_t r_vir2abs(off_t virblockno);
  12  *                      Translate virtual block number in file to absolute
  13  *                      disk block number.  Returns 0 if the file contains
  14  *                      a hole, or -1 if the block lies past the end of file.
  15  *
  16  *              ino_t r_readdir(char *name);
  17  *                      Return next directory entry or 0 if there are no more.
  18  *                      Returns -1 and sets errno on error.
  19  *
  20  *              ino_t r_lookup(ino_t cwd, const char *path);
  21  *                      A utility function that translates a pathname to an
  22  *                      inode number.  It starts from directory "cwd" unless
  23  *                      path starts with a '/', then from ROOT_INO.
  24  *                      Returns 0 and sets errno on error.
  25  *
  26  *      One function needs to be provided by the outside world:
  27  *
  28  *              void readblock(off_t blockno, char *buf, int block_size);
  29  *                      Read a block into the buffer.  Outside world handles
  30  *                      errors.
  31  */
  32
  33 #ifndef INC_RAWFS_H
  34 #define INC_RAWFS_H
  35
  36 #define ROOT_INO        ((ino_t) 1)     /* Inode nr of root dir. */
  37
  38 extern off_t r_super(int *);
  39 extern void r_stat(Ino_t file, struct stat *stp);
  40 extern off_t r_vir2abs(off_t virblockno);
  41 extern ino_t r_readdir(char *name);
  42 extern ino_t r_lookup(Ino_t cwd, const char *path);
  43
  44 /*
  45  * $PchId: rawfs.h,v 1.4 1996/04/19 08:16:36 philip Exp $
  46  */
  47
  48 #endif