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