LXR linux/include/linux/ext2

   1/*
   2 *  linux/include/linux/ext2_fs.h
   3 *
   4 * Copyright (C) 1992, 1993, 1994, 1995
   5 * Remy Card (card@masi.ibp.fr)
   6 * Laboratoire MASI - Institut Blaise Pascal
   7 * Universite Pierre et Marie Curie (Paris VI)
   8 *
   9 *  from
  10 *
  11 *  linux/include/linux/minix_fs.h
  12 *
  13 *  Copyright (C) 1991, 1992  Linus Torvalds
  14 */
  15
  16#ifndef _LINUX_EXT2_FS_H
  17#define _LINUX_EXT2_FS_H
  18
  19#include <linux/types.h>
  20#include <linux/magic.h>
  21
  22#define EXT2_NAME_LEN 255
  23
  24/*
  25 * Maximal count of links to a file
  26 */
  27#define EXT2_LINK_MAX           32000
  28
  29#define EXT2_SB_MAGIC_OFFSET    0x38
  30#define EXT2_SB_BLOCKS_OFFSET   0x04
  31#define EXT2_SB_BSIZE_OFFSET    0x18
  32
  33static inline u64 ext2_image_size(void *ext2_sb)
  34{
  35        __u8 *p = ext2_sb;
  36        if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC))
  37                return 0;
  38        return (u64)le32_to_cpup((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) <<
  39                le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET));
  40}
  41
  42#endif  /* _LINUX_EXT2_FS_H */
  43