systemd-stable/etc/udev/rules.d/60-persistent-storage.rules

# persistent storage links: /dev/{disk,tape}/{by-id,by-uuid,by-label,by-path,by-name}
# scheme based on "Linux persistent device names", 2004, Hannes Reinecke <hare@suse.de>

ACTION!="add", GOTO="persistent_storage_end"
SUBSYSTEM!="block", GOTO="persistent_storage_end"

# skip rules for inappropriate block devices
KERNEL=="ram*|loop*|fd*|nbd*|dm-*", GOTO="persistent_storage_end"

# never access removable ide devices, the drivers are causing event loops on open()
KERNEL=="hd*[!0-9]", ATTRS{removable}=="1", DRIVERS=="ide-cs|ide-floppy", GOTO="persistent_storage_end"
KERNEL=="hd*[0-9]", ATTRS{../removable}=="1", GOTO="persistent_storage_end"

# for partitions import parent information
KERNEL=="*[0-9]", IMPORT{parent}=="ID_*"

# by-id (hardware serial number)
KERNEL=="hd*[!0-9]", IMPORT{program}="ata_id --export $tempnode"
KERNEL=="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/ata-$env{ID_MODEL}_$env{ID_SERIAL}"
KERNEL=="hd*[0-9]", IMPORT{parent}=="ID_*", SYMLINK+="disk/by-id/ata-$env{ID_MODEL}_$env{ID_SERIAL}-part%n"

KERNEL=="sd*[!0-9]|sr*|st*", ATTRS{ieee1394_id}=="*", ENV{ID_SERIAL}="$attr{ieee1394_id}", ENV{ID_BUS}="ieee1394"
KERNEL=="sd*[!0-9]|sr*|st*", ENV{ID_SERIAL}=="", IMPORT{program}="usb_id -x"
KERNEL=="sd*[!0-9]|sr*|st*", ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -g -x -s %p -d $tempnode"
KERNEL=="sd*[!0-9]|sr*|st*", ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -g -x -a -s %p -d $tempnode"
KERNEL=="dasd*[!0-9]", IMPORT{program}="dasd_id --export $tempnode"
KERNEL=="sd*[!0-9]|sr*|dasd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
KERNEL=="sd*[0-9]|dasd*[0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}-part%n"
KERNEL=="st*", ENV{ID_SERIAL}=="?*", SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}"

# by-path (shortest physical path)
KERNEL=="*[!0-9]|sr*", IMPORT{program}="path_id %p", SYMLINK+="disk/by-path/$env{ID_PATH}"
KERNEL=="st*", IMPORT{program}="path_id %p", SYMLINK+="tape/by-path/$env{ID_PATH}"
KERNEL=="sr*|st*", GOTO="persistent_storage_end"
KERNEL=="*[0-9]", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part%n"

# by-label/by-uuid (filesystem properties)
KERNEL=="*[!0-9]", ATTRS{removable}=="1", GOTO="persistent_storage_end"
IMPORT{program}="vol_id --export $tempnode"
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID}"
ENV{ID_FS_USAGE}=="filesystem|other", ENV{ID_FS_LABEL_SAFE}=="?*", SYMLINK+="disk/by-label/$env{ID_FS_LABEL_SAFE}"

# BIOS Enhanced Disk Device
KERNEL=="*[!0-9]", IMPORT{program}="edd_id --export $tempnode"
KERNEL=="*[!0-9]", ENV{ID_EDD}=="?*", SYMLINK+="disk/by-id/edd-$env{ID_EDD}"
KERNEL=="*[0-9]", ENV{ID_EDD}=="?*", SYMLINK+="disk/by-id/edd-$env{ID_EDD}-part%n"

LABEL="persistent_storage_end"