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/nfs_mount.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_NFS_MOUNT_H
#define _LINUX_NFS_MOUNT_H

/*
 *  linux/include/linux/nfs_mount.h
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  structure passed from user-space to kernel-space during an nfs mount
 */
#include <linux/in.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>

/*
 * WARNING!  Do not delete or change the order of these fields.  If
 * a new field is required then add it to the end.  The version field
 * tracks which fields are present.  This will ensure some measure of
 * mount-to-kernel version compatibility.  Some of these aren't used yet
 * but here they are anyway.
 */
#define NFS_MOUNT_VERSION	6
#define NFS_MAX_CONTEXT_LEN	256

struct nfs_mount_data {
	int		version;		/* 1 */
	int		fd;			/* 1 */
	struct nfs2_fh	old_root;		/* 1 */
	int		flags;			/* 1 */
	int		rsize;			/* 1 */
	int		wsize;			/* 1 */
	int		timeo;			/* 1 */
	int		retrans;		/* 1 */
	int		acregmin;		/* 1 */
	int		acregmax;		/* 1 */
	int		acdirmin;		/* 1 */
	int		acdirmax;		/* 1 */
	struct sockaddr_in addr;		/* 1 */
	char		hostname[NFS_MAXNAMLEN + 1];		/* 1 */
	int		namlen;			/* 2 */
	unsigned int	bsize;			/* 3 */
	struct nfs3_fh	root;			/* 4 */
	int		pseudoflavor;		/* 5 */
	char		context[NFS_MAX_CONTEXT_LEN + 1];	/* 6 */
};

/* bits in the flags field visible to user space */

#define NFS_MOUNT_SOFT		0x0001	/* 1 */
#define NFS_MOUNT_INTR		0x0002	/* 1 */ /* now unused, but ABI */
#define NFS_MOUNT_SECURE	0x0004	/* 1 */
#define NFS_MOUNT_POSIX		0x0008	/* 1 */
#define NFS_MOUNT_NOCTO		0x0010	/* 1 */
#define NFS_MOUNT_NOAC		0x0020	/* 1 */
#define NFS_MOUNT_TCP		0x0040	/* 2 */
#define NFS_MOUNT_VER3		0x0080	/* 3 */
#define NFS_MOUNT_KERBEROS	0x0100	/* 3 */
#define NFS_MOUNT_NONLM		0x0200	/* 3 */
#define NFS_MOUNT_BROKEN_SUID	0x0400	/* 4 */
#define NFS_MOUNT_NOACL		0x0800	/* 4 */
#define NFS_MOUNT_STRICTLOCK	0x1000	/* reserved for NFSv4 */
#define NFS_MOUNT_SECFLAVOUR	0x2000	/* 5 non-text parsed mount data only */
#define NFS_MOUNT_NORDIRPLUS	0x4000	/* 5 */
#define NFS_MOUNT_UNSHARED	0x8000	/* 5 */
#define NFS_MOUNT_FLAGMASK	0xFFFF

#endif

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