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/nfsd/export.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * include/linux/nfsd/export.h
 * 
 * Public declarations for NFS exports. The definitions for the
 * syscall interface are in nfsctl.h
 *
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef NFSD_EXPORT_H
#define NFSD_EXPORT_H

# include <linux/types.h>

/*
 * Important limits for the exports stuff.
 */
#define NFSCLNT_IDMAX		1024
#define NFSCLNT_ADDRMAX		16
#define NFSCLNT_KEYMAX		32

/*
 * Export flags.
 *
 * Please update the expflags[] array in fs/nfsd/export.c when adding
 * a new flag.
 */
#define NFSEXP_READONLY		0x0001
#define NFSEXP_INSECURE_PORT	0x0002
#define NFSEXP_ROOTSQUASH	0x0004
#define NFSEXP_ALLSQUASH	0x0008
#define NFSEXP_ASYNC		0x0010
#define NFSEXP_GATHERED_WRITES	0x0020
#define NFSEXP_NOREADDIRPLUS    0x0040
#define NFSEXP_SECURITY_LABEL	0x0080
/* 0x100 currently unused */
#define NFSEXP_NOHIDE		0x0200
#define NFSEXP_NOSUBTREECHECK	0x0400
#define	NFSEXP_NOAUTHNLM	0x0800		/* Don't authenticate NLM requests - just trust */
#define NFSEXP_MSNFS		0x1000	/* do silly things that MS clients expect; no longer supported */
#define NFSEXP_FSID		0x2000
#define	NFSEXP_CROSSMOUNT	0x4000
#define	NFSEXP_NOACL		0x8000	/* reserved for possible ACL related use */
/*
 * The NFSEXP_V4ROOT flag causes the kernel to give access only to NFSv4
 * clients, and only to the single directory that is the root of the
 * export; further lookup and readdir operations are treated as if every
 * subdirectory was a mountpoint, and ignored if they are not themselves
 * exported.  This is used by nfsd and mountd to construct the NFSv4
 * pseudofilesystem, which provides access only to paths leading to each
 * exported filesystem.
 */
#define	NFSEXP_V4ROOT		0x10000
#define NFSEXP_PNFS		0x20000

/* All flags that we claim to support.  (Note we don't support NOACL.) */
#define NFSEXP_ALLFLAGS		0x3FEFF

/* The flags that may vary depending on security flavor: */
#define NFSEXP_SECINFO_FLAGS	(NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
					| NFSEXP_ALLSQUASH \
					| NFSEXP_INSECURE_PORT)


#endif /* NFSD_EXPORT_H */

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