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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * linux/include/linux/ext2_fs.h | |
4 | * | |
5 | * Copyright (C) 1992, 1993, 1994, 1995 | |
6 | * Remy Card (card@masi.ibp.fr) | |
7 | * Laboratoire MASI - Institut Blaise Pascal | |
8 | * Universite Pierre et Marie Curie (Paris VI) | |
9 | * | |
10 | * from | |
11 | * | |
12 | * linux/include/linux/minix_fs.h | |
13 | * | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | */ | |
16 | ||
17 | #ifndef _LINUX_EXT2_FS_H | |
18 | #define _LINUX_EXT2_FS_H | |
19 | ||
20 | #include <linux/types.h> | |
e18fa700 | 21 | #include <linux/magic.h> |
1da177e4 | 22 | |
f7699f2b | 23 | #define EXT2_NAME_LEN 255 |
1da177e4 LT |
24 | |
25 | /* | |
26 | * Maximal count of links to a file | |
27 | */ | |
28 | #define EXT2_LINK_MAX 32000 | |
29 | ||
39429c5e AV |
30 | #define EXT2_SB_MAGIC_OFFSET 0x38 |
31 | #define EXT2_SB_BLOCKS_OFFSET 0x04 | |
32 | #define EXT2_SB_BSIZE_OFFSET 0x18 | |
33 | ||
34 | static inline u64 ext2_image_size(void *ext2_sb) | |
35 | { | |
36 | __u8 *p = ext2_sb; | |
37 | if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC)) | |
38 | return 0; | |
39 | return (u64)le32_to_cpup((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) << | |
40 | le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET)); | |
41 | } | |
42 | ||
1da177e4 | 43 | #endif /* _LINUX_EXT2_FS_H */ |