| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) << |
| 40 | le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET)); |
| 41 | } |
| 42 | |
| 43 | #endif /* _LINUX_EXT2_FS_H */ |