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1da177e4 LT |
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> | |
e18fa700 | 20 | #include <linux/magic.h> |
1da177e4 | 21 | |
f7699f2b | 22 | #define EXT2_NAME_LEN 255 |
1da177e4 LT |
23 | |
24 | /* | |
25 | * Maximal count of links to a file | |
26 | */ | |
27 | #define EXT2_LINK_MAX 32000 | |
28 | ||
39429c5e AV |
29 | #define EXT2_SB_MAGIC_OFFSET 0x38 |
30 | #define EXT2_SB_BLOCKS_OFFSET 0x04 | |
31 | #define EXT2_SB_BSIZE_OFFSET 0x18 | |
32 | ||
33 | static 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 | ||
1da177e4 | 42 | #endif /* _LINUX_EXT2_FS_H */ |