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File 10-dm.rules

# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.

# Udev rules for device-mapper devices.
#
# These rules create a DM control node in /dev/mapper directory.
# The rules also create nodes named dm-x (x is a number) in /dev
# directory and symlinks to these nodes with names given by
# the actual DM names. Some udev environment variables are set
# for use in later rules:
#   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_UDEV_RULES_VSN - DM udev rules version
#
# These rules cover only basic device-mapper functionality in udev.
#
# Various DM subsystems may contain further subsystem-specific rules
# in 11-dm-<subsystem_name>.rules which should be installed together
# with the DM subsystem and which extend these basic rules.
# For example:
#   11-dm-lvm.rules for LVM subsystem
#   11-dm-mpath.rules for multipath subsystem (since version 0.6.0, recommended!)
#
# Even more specific rules may be required by subsystems so always
# check subsystem's upstream repository for recent set of rules.
# Also, keep in mind that recent rules may also require recent
# subsystem-specific binaries.

KERNEL=="device-mapper", NAME="mapper/control"

SUBSYSTEM!="block", GOTO="dm_end"
KERNEL!="dm-[0-9]*", GOTO="dm_end"

# Device created, major and minor number assigned - "add" event generated.
# Table loaded - no event generated.
# Device resumed (or renamed) - "change" event generated.
# Device removed - "remove" event generated.
#
# The dm-X nodes are always created, even on "add" event, we can't suppress
# that (the node is created even earlier with devtmpfs). All the symlinks
# (e.g. /dev/mapper) are created in right time after a device has its table
# loaded and is properly resumed. For this reason, direct use of dm-X nodes
# is not recommended.
ACTION!="add|change", GOTO="dm_end"

# Decode udev control flags and set environment variables appropriately.
# These flags are encoded in DM_COOKIE variable that was introduced in
# kernel version 2.6.31. Therefore, we can use this feature with
# kernels >= 2.6.31 only. Cookie is not decoded for remove event.
ENV{DM_COOKIE}=="?*", IMPORT{program}="/usr/sbin/dmsetup udevflags $env{DM_COOKIE}"

# Rule out easy-to-detect inappropriate events first.
ENV{DISK_RO}=="1", GOTO="dm_disable"

# There is no cookie set nor any flags encoded in events not originating
# in libdevmapper so we need to detect this and try to behave correctly.
# For such spurious events, regenerate all flags from current udev database content
# (this information would normally be inaccessible for spurious ADD and CHANGE events).
ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", ENV{DM_ACTIVATION}="1", GOTO="dm_flags_done"
IMPORT{db}="DM_UDEV_DISABLE_DM_RULES_FLAG"
IMPORT{db}="DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG"
IMPORT{db}="DM_UDEV_DISABLE_DISK_RULES_FLAG"
IMPORT{db}="DM_UDEV_DISABLE_OTHER_RULES_FLAG"
IMPORT{db}="DM_UDEV_LOW_PRIORITY_FLAG"
IMPORT{db}="DM_UDEV_DISABLE_LIBRARY_FALLBACK_FLAG"
IMPORT{db}="DM_UDEV_PRIMARY_SOURCE_FLAG"
IMPORT{db}="DM_UDEV_FLAG7"
IMPORT{db}="DM_UDEV_RULES_VSN"
LABEL="dm_flags_done"

# Normally, we operate on "change" events. But when coldplugging, there's an
# "add" event present. We have to recognize this and do our actions in this
# particular situation, too. Also, we don't want the nodes to be created
# prematurely on "add" events while not coldplugging. We check
# DM_UDEV_PRIMARY_SOURCE_FLAG to see if the device was activated correctly
# before and if not, we ignore the "add" event totally. This way we can support
# udev triggers generating "add" events (e.g. "udevadm trigger --action=add" or
# "echo add > /sys/block/<dm_device>/uevent"). The trigger with "add" event is
# also used at boot to reevaluate udev rules for all existing devices activated
# before (e.g. in initrd). If udev is used in initrd, we require the udev init
# script to not remove the existing udev database so we can reuse the information
# stored at the time of device activation in the initrd.
ACTION!="add", GOTO="dm_no_coldplug"
ENV{DM_UDEV_RULES_VSN}!="1", ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}!="1", GOTO="dm_disable"
ENV{DM_ACTIVATION}="1"
LABEL="dm_no_coldplug"

# Putting it together, following table is used to recognize genuine and spurious events.
# N.B. Spurious events are generated based on use of the WATCH udev
# rule or by triggering an event manually by "udevadm trigger" call
# or by "echo <event_name> > /sys/block/dm-X/uevent".
#
#        EVENT              DM_UDEV_PRIMARY_SOURCE_FLAG   DM_ACTIVATION
# ======================================================================
# add event (genuine)                  0                        0
# change event (genuine)               1                        1
# add event (spurious)
#   |_ dev still not active            0                        0
#   \_ dev already active              1                        1
# change event (spurious)
#   |_ dev still not active            0                        0
#   \_ dev already active              1                        0

# "dm" sysfs subdirectory is available in newer versions of DM
# only (kernels >= 2.6.29). We have to check for its existence
# and use dmsetup tool instead to get the DM name, uuid and 
# suspended state if the "dm" subdirectory is not present.
# The "suspended" item was added even later (kernels >= 2.6.31),
# so we also have to call dmsetup if the kernel version used
# is in between these releases.
TEST=="dm", ENV{DM_NAME}="$attr{dm/name}", ENV{DM_UUID}="$attr{dm/uuid}", ENV{DM_SUSPENDED}="$attr{dm/suspended}"
TEST!="dm", IMPORT{program}="/usr/sbin/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o name,uuid,suspended"
ENV{DM_SUSPENDED}!="?*", IMPORT{program}="/usr/sbin/dmsetup info -j %M -m %m -c --nameprefixes --noheadings --rows -o suspended"

# dmsetup tool provides suspended state information in textual
# form with values "Suspended"/"Active". We translate it to
# 0/1 respectively to be consistent with sysfs values.
ENV{DM_SUSPENDED}=="Active", ENV{DM_SUSPENDED}="0"
ENV{DM_SUSPENDED}=="Suspended", ENV{DM_SUSPENDED}="1"

# This variable provides a reliable way to check that device-mapper
# rules were installed. It means that all needed variables are set
# by these rules directly so there's no need to acquire them again
# later. Other rules can alternate the functionality based on this
# fact (e.g. fallback to rules that behave correctly even without
# these rules installed). It also provides versioning for any
# possible future changes.
# VSN 1 - original rules
# VSN 2 - add support for synthesized events
ENV{DM_UDEV_RULES_VSN}="2"

ENV{DM_UDEV_DISABLE_DM_RULES_FLAG}!="1", ENV{DM_NAME}=="?*", SYMLINK+="mapper/$env{DM_NAME}"

# Avoid processing and scanning a DM device in the other (foreign)
# rules if it is in suspended state. However, we still keep 'disk'
# and 'DM subsystem' related rules enabled in this case.
ENV{DM_SUSPENDED}=="1", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"

GOTO="dm_end"

LABEL="dm_disable"
ENV{DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG}="1"
ENV{DM_UDEV_DISABLE_DISK_RULES_FLAG}="1"
ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="1"
OPTIONS:="nowatch"

LABEL="dm_end"

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:31
..	DIR	-	drwxr-xr-x	2025-04-23 10:58:40
10-dm.rules	text/plain	7.1 KB	-r--r--r--	2025-07-15 09:03:10
11-dm-parts.rules	text/plain	1.41 KB	-rw-r--r--	2025-04-22 01:55:39
13-dm-disk.rules	text/plain	1.75 KB	-r--r--r--	2025-07-15 09:03:10
40-elevator.rules	text/plain	728 B	-rw-r--r--	2025-04-22 01:57:50
40-redhat.rules	text/plain	1.79 KB	-rw-r--r--	2025-04-22 01:57:53
40-usb-blacklist.rules	text/plain	457 B	-rw-r--r--	2022-10-08 10:09:12
50-udev-default.rules	text/plain	3.66 KB	-rw-r--r--	2025-04-22 01:58:19
60-alias-kmsg.rules	text/plain	357 B	-rw-r--r--	2025-04-22 01:57:55
60-block.rules	text/plain	626 B	-rw-r--r--	2025-04-22 01:57:50
60-cdrom_id.rules	text/plain	1.05 KB	-rw-r--r--	2018-06-22 11:11:49
60-drm.rules	text/plain	413 B	-rw-r--r--	2018-06-22 11:11:49
60-evdev.rules	text/plain	974 B	-rw-r--r--	2018-06-22 11:11:49
60-fido-id.rules	text/plain	165 B	-rw-r--r--	2025-04-22 01:57:54
60-input-id.rules	text/plain	282 B	-rw-r--r--	2018-06-22 11:11:49
60-net.rules	text/plain	129 B	-rw-r--r--	2022-08-10 01:03:37
60-persistent-alsa.rules	text/plain	616 B	-rw-r--r--	2018-06-22 11:11:49
60-persistent-input.rules	text/plain	2.65 KB	-rw-r--r--	2018-06-22 11:11:49
60-persistent-storage-tape.rules	text/plain	1.61 KB	-rw-r--r--	2025-04-22 01:57:57
60-persistent-storage.rules	text/plain	6.38 KB	-rw-r--r--	2018-06-22 11:11:49
60-persistent-v4l.rules	text/plain	769 B	-rw-r--r--	2018-06-22 11:11:49
60-raw.rules	text/plain	326 B	-rw-r--r--	2024-04-06 01:02:51
60-sensor.rules	text/plain	727 B	-rw-r--r--	2018-06-22 11:11:49
60-serial.rules	text/plain	1.16 KB	-rw-r--r--	2018-06-22 11:11:49
60-tpm-udev.rules	text/plain	211 B	-rw-r--r--	2019-10-17 03:56:47
61-scsi-sg3_id.rules	text/plain	4.67 KB	-rw-r--r--	2017-09-18 07:15:01
63-fc-wwpn-id.rules	text/plain	624 B	-rw-r--r--	2022-10-08 10:09:12
63-scsi-sg3_symlink.rules	text/plain	2.82 KB	-rw-r--r--	2015-10-29 08:52:08
64-btrfs.rules	text/plain	616 B	-rw-r--r--	2025-04-22 01:58:19
66-kpartx.rules	text/plain	1.12 KB	-rw-r--r--	2025-04-22 01:55:39
68-del-part-nodes.rules	text/plain	1.12 KB	-rw-r--r--	2025-04-22 01:55:39
70-joystick.rules	text/plain	432 B	-rw-r--r--	2018-06-22 11:11:49
70-mouse.rules	text/plain	734 B	-rw-r--r--	2018-06-22 11:11:49
70-power-switch.rules	text/plain	568 B	-rw-r--r--	2018-06-22 11:11:49
70-touchpad.rules	text/plain	473 B	-rw-r--r--	2018-06-22 11:11:49
70-uaccess.rules	text/plain	2.61 KB	-rw-r--r--	2018-06-22 11:11:49
71-biosdevname.rules	text/plain	995 B	-rw-r--r--	2019-10-18 08:07:58
71-prefixdevname.rules	text/plain	403 B	-rw-r--r--	2019-12-16 07:52:15
71-seat.rules	text/plain	2.69 KB	-rw-r--r--	2025-04-22 01:58:19
73-idrac.rules	text/plain	316 B	-rw-r--r--	2025-04-22 01:57:49
73-seat-late.rules	text/plain	636 B	-rw-r--r--	2025-04-22 01:58:24
75-net-description.rules	text/plain	452 B	-rw-r--r--	2018-06-22 11:11:49
75-probe_mtd.rules	text/plain	174 B	-rw-r--r--	2018-06-22 11:11:49
78-sound-card.rules	text/plain	4.7 KB	-rw-r--r--	2018-06-22 11:11:49
80-drivers.rules	text/plain	615 B	-rw-r--r--	2018-06-22 11:11:49
80-net-setup-link.rules	text/plain	292 B	-rw-r--r--	2018-06-22 11:11:49
84-nm-drivers.rules	text/plain	533 B	-rw-r--r--	2022-10-10 01:57:58
85-nm-unmanaged.rules	text/plain	1.97 KB	-rw-r--r--	2022-10-11 07:42:01
90-iprutils.rules	text/plain	70 B	-rw-r--r--	2020-05-08 02:19:42
90-nm-thunderbolt.rules	text/plain	588 B	-rw-r--r--	2022-10-10 01:57:58
90-vconsole.rules	text/plain	510 B	-rw-r--r--	2025-04-22 01:58:19
95-dm-notify.rules	text/plain	483 B	-r--r--r--	2025-07-15 09:03:10
98-kexec.rules	text/plain	695 B	-rw-r--r--	2024-09-24 08:36:00
99-nfs.rules	text/plain	95 B	-rw-r--r--	2025-06-04 10:53:59
99-qemu-guest-agent.rules	text/plain	130 B	-rw-r--r--	2025-08-07 12:04:07
99-systemd.rules	text/plain	4.26 KB	-rw-r--r--	2025-04-22 01:58:19

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