晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/linux/efs_fs_sb.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * efs_fs_sb.h
 *
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
 */

#ifndef __EFS_FS_SB_H__
#define __EFS_FS_SB_H__

#include <linux/types.h>
#include <linux/magic.h>

/* EFS superblock magic numbers */
#define EFS_MAGIC	0x072959
#define EFS_NEWMAGIC	0x07295a

#define IS_EFS_MAGIC(x)	((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))

#define EFS_SUPER		1
#define EFS_ROOTINODE		2

/* efs superblock on disk */
struct efs_super {
	__be32		fs_size;        /* size of filesystem, in sectors */
	__be32		fs_firstcg;     /* bb offset to first cg */
	__be32		fs_cgfsize;     /* size of cylinder group in bb's */
	__be16		fs_cgisize;     /* bb's of inodes per cylinder group */
	__be16		fs_sectors;     /* sectors per track */
	__be16		fs_heads;       /* heads per cylinder */
	__be16		fs_ncg;         /* # of cylinder groups in filesystem */
	__be16		fs_dirty;       /* fs needs to be fsck'd */
	__be32		fs_time;        /* last super-block update */
	__be32		fs_magic;       /* magic number */
	char		fs_fname[6];    /* file system name */
	char		fs_fpack[6];    /* file system pack name */
	__be32		fs_bmsize;      /* size of bitmap in bytes */
	__be32		fs_tfree;       /* total free data blocks */
	__be32		fs_tinode;      /* total free inodes */
	__be32		fs_bmblock;     /* bitmap location. */
	__be32		fs_replsb;      /* Location of replicated superblock. */
	__be32		fs_lastialloc;  /* last allocated inode */
	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
	__be32		fs_checksum;    /* checksum of volume portion of fs */
};

/* efs superblock information in memory */
struct efs_sb_info {
	__u32	fs_magic;	/* superblock magic number */
	__u32	fs_start;	/* first block of filesystem */
	__u32	first_block;	/* first data block in filesystem */
	__u32	total_blocks;	/* total number of blocks in filesystem */
	__u32	group_size;	/* # of blocks a group consists of */ 
	__u32	data_free;	/* # of free data blocks */
	__u32	inode_free;	/* # of free inodes */
	__u16	inode_blocks;	/* # of blocks used for inodes in every grp */
	__u16	total_groups;	/* # of groups */
};

#endif /* __EFS_FS_SB_H__ */

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