1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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> |
21 | #include <linux/magic.h> |
22 | |
23 | #define EXT2_NAME_LEN 255 |
24 | |
25 | /* |
26 | * Maximal count of links to a file |
27 | */ |
28 | #define EXT2_LINK_MAX 32000 |
29 | |
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(p: (__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) << |
40 | le32_to_cpup(p: (__le32 *)(p + EXT2_SB_BSIZE_OFFSET)); |
41 | } |
42 | |
43 | #endif /* _LINUX_EXT2_FS_H */ |
44 | |