systemd/rules.d/60-persistent-storage.rules.in

# do not edit this file, it will be overwritten on update

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

ACTION=="remove", GOTO="persistent_storage_end"
ENV{UDEV_DISABLE_PERSISTENT_STORAGE_RULES_FLAG}=="1", GOTO="persistent_storage_end"

SUBSYSTEM!="block|ubi", GOTO="persistent_storage_end"
KERNEL!="loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|sr*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*|ubi*|scm*|pmem*|nbd*|zd*", GOTO="persistent_storage_end"

# ignore partitions that span the entire disk
TEST=="whole_disk", GOTO="persistent_storage_end"

# For partitions import parent disk ID_* information, except ID_FS_*.
#
# This is particularly important on media where a filesystem superblock and
# partition table are found on the same level, e.g. common Linux distro ISO
# installation media.
#
# In the case where a partition device points to the same filesystem that
# was detected on the parent disk, the ID_FS_* information is already
# present on the partition devices as well as the parent, so no need to
# propagate it. In the case where the partition device points to a different
# filesystem, merging the parent ID_FS_ properties would lead to
# inconsistencies, so we avoid doing so.
ENV{DEVTYPE}=="partition", \
  IMPORT{parent}="ID_[!F]*", IMPORT{parent}="ID_", \
  IMPORT{parent}="ID_F[!S]*", IMPORT{parent}="ID_F", \
  IMPORT{parent}="ID_FS[!_]*", IMPORT{parent}="ID_FS"

ENV{DEVTYPE}=="partition", ENV{.PART_SUFFIX}="-part%n"
ENV{DEVTYPE}!="partition", ENV{.PART_SUFFIX}=""

# NVMe
KERNEL!="nvme*[0-9]n*[0-9]|nvme*[0-9]n*[0-9]p*[0-9]", GOTO="nvme_end"

ATTRS{serial}=="?*",       ENV{ID_SERIAL_SHORT}="$attr{serial}"
ATTRS{wwid}=="?*",         ENV{ID_WWN}="$attr{wwid}"
ATTRS{model}=="?*",        ENV{ID_MODEL}="$attr{model}"
ATTRS{firmware_rev}=="?*", ENV{ID_REVISION}="$attr{firmware_rev}"
ATTRS{nsid}=="?*",         ENV{ID_NSID}="$attr{nsid}"

ENV{ID_WWN}=="?*", SYMLINK+="disk/by-id/nvme-$env{ID_WWN}$env{.PART_SUFFIX}"

# obsolete symlink with non-escaped characters, kept for backward compatibility
ENV{ID_MODEL}=="?*", ENV{ID_SERIAL_SHORT}=="?*", ENV{ID_MODEL}!="*/*", ENV{ID_SERIAL_SHORT}!="*/*", \
  ENV{ID_SERIAL}="$env{ID_MODEL}_$env{ID_SERIAL_SHORT}", SYMLINK+="disk/by-id/nvme-$env{ID_SERIAL}$env{.PART_SUFFIX}"
# obsolete symlink that might get overridden on adding a new nvme controller, kept for backward compatibility
ENV{ID_MODEL}=="?*", ENV{ID_SERIAL_SHORT}=="?*", OPTIONS="string_escape=replace", \
  ENV{ID_SERIAL}="$env{ID_MODEL}_$env{ID_SERIAL_SHORT}", SYMLINK+="disk/by-id/nvme-$env{ID_SERIAL}$env{.PART_SUFFIX}"
ENV{ID_MODEL}=="?*", ENV{ID_SERIAL_SHORT}=="?*", ENV{ID_NSID}=="?*", OPTIONS="string_escape=replace", \
  ENV{ID_SERIAL}="$env{ID_MODEL}_$env{ID_SERIAL_SHORT}_$env{ID_NSID}", SYMLINK+="disk/by-id/nvme-$env{ID_SERIAL}$env{.PART_SUFFIX}"

LABEL="nvme_end"

# virtio-blk
KERNEL=="vd*", ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}", SYMLINK+="disk/by-id/virtio-$env{ID_SERIAL}$env{.PART_SUFFIX}"

# ATA
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", SUBSYSTEMS=="scsi", ATTRS{vendor}=="ATA", IMPORT{program}="ata_id --export $devnode"
KERNEL=="sd*[!0-9]|sr*", ENV{ID_BUS}=="ata", ENV{ID_ATA_PERIPHERAL_DEVICE_TYPE}=="20", PROGRAM="scsi_id -u -g $devnode", \
  SYMLINK+="disk/by-id/scsi-$result$env{.PART_SUFFIX}"

# ATAPI devices (SPC-3 or later)
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", SUBSYSTEMS=="scsi", ATTRS{type}=="5", ATTRS{scsi_level}=="[6-9]*", IMPORT{program}="ata_id --export $devnode"

# Run ata_id on non-removable USB Mass Storage (SATA/PATA disks in enclosures)
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", ATTR{removable}=="0", SUBSYSTEMS=="usb", IMPORT{program}="ata_id --export $devnode"

# Also import properties from usb_id for USB devices
KERNEL=="sd*[!0-9]|sr*", SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id"

# SCSI devices
KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", IMPORT{program}="scsi_id --export --allowlisted -d $devnode", ENV{ID_BUS}="scsi"
KERNEL=="cciss*", ENV{DEVTYPE}=="disk", ENV{ID_SERIAL}!="?*", IMPORT{program}="scsi_id --export --allowlisted -d $devnode", ENV{ID_BUS}="cciss"

KERNEL=="sd*|sr*|cciss*", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}$env{.PART_SUFFIX}"
# Previously, ata_id in the above might not be able to retrieve attributes correctly,
# and properties from usb_id were used as a fallback. See issue #24921 and PR #24923.
# To keep backward compatibility, still we need to create symlinks based on USB serial.
# See issue #25179.
KERNEL=="sd*|sr*|cciss*", ENV{ID_USB_SERIAL}=="?*", SYMLINK+="disk/by-id/usb-$env{ID_USB_SERIAL}$env{.PART_SUFFIX}"

# PMEM devices
KERNEL=="pmem*", ATTRS{uuid}=="?*", SYMLINK+="disk/by-id/pmem-$attr{uuid}$env{.PART_SUFFIX}"

# FireWire
KERNEL=="sd*|sr*", ATTRS{ieee1394_id}=="?*", SYMLINK+="disk/by-id/ieee1394-$attr{ieee1394_id}$env{.PART_SUFFIX}"

# MMC
KERNEL=="mmcblk[0-9]|mmcblk[0-9]p[0-9]*", SUBSYSTEMS=="mmc", GOTO="mmc_start"
GOTO="mmc_end"
LABEL="mmc_start"
ATTRS{name}=="?*", ENV{ID_NAME}="$attr{name}"
ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}"
ENV{ID_NAME}=="?*", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/mmc-$env{ID_NAME}_$env{ID_SERIAL}$env{.PART_SUFFIX}"
LABEL="mmc_end"

# Memstick
KERNEL=="msblk[0-9]|mspblk[0-9]|msblk[0-9]p[0-9]|mspblk[0-9]p[0-9]", SUBSYSTEMS=="memstick", GOTO="memstick_start"
GOTO="memstick_end"
LABEL="memstick_start"
ATTRS{name}=="?*", ENV{ID_NAME}="$attr{name}"
ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}"
ENV{ID_NAME}=="?*", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/memstick-$env{ID_NAME}_$env{ID_SERIAL}$env{.PART_SUFFIX}"
LABEL="memstick_end"

# by-path
ENV{DEVTYPE}=="disk", DEVPATH!="*/virtual/*", IMPORT{builtin}="path_id"
ENV{DEVTYPE}=="disk", SUBSYSTEMS=="nvme-subsystem", IMPORT{builtin}="path_id"
KERNEL=="mmcblk[0-9]boot[0-9]", ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*",                   SYMLINK+="disk/by-path/$env{ID_PATH}-boot%n"
KERNEL=="mmcblk[0-9]boot[0-9]", ENV{DEVTYPE}=="disk", ENV{ID_PATH_WITH_USB_REVISION}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH_WITH_USB_REVISION}-boot%n"
KERNEL!="mmcblk[0-9]boot[0-9]",                       ENV{ID_PATH}=="?*",                   SYMLINK+="disk/by-path/$env{ID_PATH}$env{.PART_SUFFIX}"
KERNEL!="mmcblk[0-9]boot[0-9]",                       ENV{ID_PATH_ATA_COMPAT}=="?*",        SYMLINK+="disk/by-path/$env{ID_PATH_ATA_COMPAT}$env{.PART_SUFFIX}"
KERNEL!="mmcblk[0-9]boot[0-9]",                       ENV{ID_PATH_WITH_USB_REVISION}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH_WITH_USB_REVISION}$env{.PART_SUFFIX}"

# legacy virtio-pci by-path links (deprecated)
KERNEL=="vd*", ENV{ID_PATH}=="pci-*",                   SYMLINK+="disk/by-path/virtio-$env{ID_PATH}$env{.PART_SUFFIX}"
KERNEL=="vd*", ENV{ID_PATH_WITH_USB_REVISION}=="pci-*", SYMLINK+="disk/by-path/virtio-$env{ID_PATH_WITH_USB_REVISION}$env{.PART_SUFFIX}"

{% if HAVE_BLKID %}
# allow admin to disable probing the filesystem for slow devices like floppy disk drives
ENV{UDEV_DISABLE_PERSISTENT_STORAGE_BLKID_FLAG}=="1", GOTO="persistent_storage_blkid_probe_end"

# probe filesystem metadata of optical drives which have a media inserted
KERNEL=="sr*", ENV{DISK_EJECT_REQUEST}!="?*", ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*", ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="?*", \
  IMPORT{builtin}="blkid --hint=session_offset=$env{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}"
# single-session CDs do not have ID_CDROM_MEDIA_SESSION_LAST_OFFSET
KERNEL=="sr*", ENV{DISK_EJECT_REQUEST}!="?*", ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*", ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="", \
  IMPORT{builtin}="blkid --noraid"

# probe filesystem metadata of disks
KERNEL!="sr*|mmcblk[0-9]boot[0-9]", IMPORT{builtin}="blkid"

LABEL="persistent_storage_blkid_probe_end"
{% endif %}

# by-label/by-uuid links (filesystem metadata)
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_LABEL_ENC}=="?*", SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"

# by-id (World Wide Name)
ENV{ID_WWN_WITH_EXTENSION}=="?*", SYMLINK+="disk/by-id/wwn-$env{ID_WWN_WITH_EXTENSION}$env{.PART_SUFFIX}"

# by-partlabel/by-partuuid links (partition metadata)
ENV{ID_PART_ENTRY_UUID}=="?*", SYMLINK+="disk/by-partuuid/$env{ID_PART_ENTRY_UUID}"
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="disk/by-partlabel/$env{ID_PART_ENTRY_NAME}"

# by-path/<path>/by-* links (path + partition/filesystem metadata)
ENV{ID_PATH}=="", GOTO="persistent_storage_by-path_parts_end"
ENV{DEVTYPE}!="partition", GOTO="persistent_storage_by-path_parts_end"

SYMLINK+="disk/by-path/$env{ID_PATH}-part/by-partnum/%n"
ENV{ID_PART_ENTRY_UUID}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part/by-partuuid/$env{ID_PART_ENTRY_UUID}"
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part/by-partlabel/$env{ID_PART_ENTRY_NAME}"

ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part/by-uuid/$env{ID_FS_UUID_ENC}"
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_LABEL_ENC}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part/by-label/$env{ID_FS_LABEL_ENC}"

LABEL="persistent_storage_by-path_parts_end"

# by-diskseq link (if an app is told to open a path like this, they may parse
# the diskseq number from the path, then issue BLKGETDISKSEQ to verify they really got
# the right device, to access specific disks in a race-free fashion)
ENV{DISKSEQ}=="?*", ENV{ID_IGNORE_DISKSEQ}!="1", SYMLINK+="disk/by-diskseq/$env{DISKSEQ}$env{.PART_SUFFIX}"

# Create symlinks that allow referencing loopback devices by their backing file's inode number
ENV{ID_LOOP_BACKING_DEVICE}!="", ENV{ID_LOOP_BACKING_INODE}!="", SYMLINK+="disk/by-loop-inode/$env{ID_LOOP_BACKING_DEVICE}-$env{ID_LOOP_BACKING_INODE}$env{.PART_SUFFIX}"

# Similar, but uses the .lo_file_name field of the loopback device (note that
# this is basically just a free-form string passed from userspace to the kernel
# when the device is created, it is not necessarily a file system path like the
# "loop/backing_file" sysfs attribute, which is always an absolute path)
ENV{ID_LOOP_BACKING_FILENAME_ENC}!="", SYMLINK+="disk/by-loop-ref/$env{ID_LOOP_BACKING_FILENAME_ENC}$env{.PART_SUFFIX}"

LABEL="persistent_storage_end"