1. 根目录:
2. include
3. linux
4. cramfs_fs_sb.h

#ifndef _CRAMFS_FS_SB
#define _CRAMFS_FS_SB

/*
 * cramfs super-block data in memory
 */
struct cramfs_sb_info {
			unsigned long magic;
			unsigned long size;
			unsigned long blocks;
			unsigned long files;
			unsigned long flags;
};

static inline struct cramfs_sb_info *CRAMFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

#endif