44 lines
967 B
C
44 lines
967 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/include/linux/ext2_fs.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT2_FS_H
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#define _LINUX_EXT2_FS_H
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#include <linux/types.h>
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#include <linux/magic.h>
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#define EXT2_NAME_LEN 255
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/*
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* Maximal count of links to a file
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*/
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#define EXT2_LINK_MAX 32000
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#define EXT2_SB_MAGIC_OFFSET 0x38
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#define EXT2_SB_BLOCKS_OFFSET 0x04
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#define EXT2_SB_BSIZE_OFFSET 0x18
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static inline u64 ext2_image_size(void *ext2_sb)
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{
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__u8 *p = ext2_sb;
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if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC))
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return 0;
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return (u64)le32_to_cpup((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) <<
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le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET));
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}
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#endif /* _LINUX_EXT2_FS_H */
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