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/share/doc/device-mapper/12-dm-permissions.rules
# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.

# Udev rules for device-mapper devices.
#
# These rules set permissions for DM devices.
#
# This file is considered to be a template where users can put their
# own entries and then put a copy of it manually to a usual place with
# user-edited udev rules (usually /etc/udev/rules.d).
#
# There are some environment variables set that can be used:
#   DM_UDEV_RULES_VSN - DM udev rules version
#   DM_NAME - actual DM device's name
#   DM_UUID - UUID set for DM device (blank if not specified)
#   DM_SUSPENDED - suspended state of DM device (0 or 1)
#   DM_LV_NAME - logical volume name (not set if LVM device not present)
#   DM_VG_NAME - volume group name (not set if LVM device not present)
#   DM_LV_LAYER - logical volume layer (not set if LVM device not present)

# "add" event is processed on coldplug only!
ACTION!="add|change", GOTO="dm_end"
ENV{DM_UDEV_RULES_VSN}!="?*", GOTO="dm_end"

# A few demonstrational examples...


# PLAIN DM DEVICES
#
# Set permissions for a DM device named 'my_device' exactly
# ENV{DM_NAME}=="my_device", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for all DM devices having 'MY_UUID-' UUID prefix
# ENV{DM_UUID}=="MY_UUID-?*", OWNER:="root", GROUP:="root", MODE:="660"


# LVM DEVICES
#
# Set permissions for all LVM devices
# ENV{DM_UUID}=="LVM-?*", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for all devices that belong to one LVM VG
# ENV{DM_VG_NAME}=="VolGroup00", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for an LVM device with VG named VolGroup00 and LV named LogVol00 exactly
# ENV{DM_VG_NAME}=="VolGroup00", ENV{DM_LV_NAME}=="LogVol00", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for all LVM devices that does not belong to a VG named VolGroup00
# ENV{DM_VG_NAME}!="VolGroup00", OWNER:="root", GROUP:="root", MODE:="660"


# ENCRYPTED DEVICES (using cryptsetup >= 1.1)
#
# Set permissions for all encrypted devices created by cryptsetup (plain devices)
# ENV{DM_UUID}=="CRYPT-PLAIN-?*", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for all encrypted devices created by cryptsetup (LUKS extension)
# ENV{DM_UUID}=="CRYPT-LUKS1-?*", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for an encrypted device created by cryptsetup and having an exact luks UUID
# ENV{DM_UUID}=="CRYPT-LUKS1-22fce5c8313c43c68d84b50a3b0fee78-?*", OWNER:="root", GROUP:="root", MODE:="660"


# MULTIPATH DEVICES
#
# Set permissions for all multipath devices
# ENV{DM_UUID}=="mpath-?*", OWNER:="root", GROUP:="root", MODE:="660"

# Set permissions for first two partitions created on a multipath device (and detected by kpartx)
# ENV{DM_UUID}=="part[1-2]-mpath-?*", OWNER:="root", GROUP:="root", MODE:="660"


# ...you can use any combination of the comparisons with the environment variables
# listed at the beginning of this file (udev provides simple pattern matching by
# using *, ? and [] that you can use, see 'man udev' for more information).

# Set default permissions for all DM devices if not set before.
# OWNER:="root", GROUP:="root", MODE:="660"

LABEL="dm_end"

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