/lib/udev/rules.d/60-persistent-storage-dm.rules is in dmsetup 2:1.02.110-1ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | # Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
# Udev rules for device-mapper devices.
#
# These rules create symlinks in /dev/disk directory.
# Symlinks that depend on probing filesystem type,
# label and uuid are created only if the device is not
# suspended.
# "add" event is processed on coldplug only!
ACTION!="add|change", GOTO="dm_end"
ENV{DM_UDEV_RULES}!="?*", GOTO="dm_end"
ENV{DM_UDEV_DISABLE_DISK_RULES_FLAG}=="1", GOTO="dm_end"
SYMLINK+="disk/by-id/dm-name-$env{DM_NAME}"
ENV{DM_UUID}=="?*", SYMLINK+="disk/by-id/dm-uuid-$env{DM_UUID}"
ENV{DM_SUSPENDED}=="1", GOTO="dm_end"
ENV{DM_NOSCAN}=="1", GOTO="dm_watch"
IMPORT{builtin}="blkid"
ENV{DM_UDEV_LOW_PRIORITY_FLAG}=="1", OPTIONS="link_priority=-100"
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
ENV{ID_FS_USAGE}=="filesystem|other", ENV{ID_FS_LABEL_ENC}=="?*", SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"
# Add inotify watch to track changes on this device.
# Using the watch rule is not optimal - it generates a lot of spurious
# and useless events whenever the device opened for read-write is closed.
# The best would be to generete the event directly in the tool changing
# relevant information so only relevant events will be processed
# (like creating a filesystem, changing filesystem label etc.).
#
# But let's use this until we have something better...
LABEL="dm_watch"
OPTIONS+="watch"
LABEL="dm_end"
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