I am attaching an updated and cleaned-up file. Please add it ASAP to the package because many users have complained about this (usually to me) in the last year.
-- ciao, Marco
KERNEL!="dm-*", GOTO="device_mapper_end"
ACTION!="add|change", GOTO="device_mapper_end"
IMPORT{program}="/sbin/dmsetup export -j $major -m $minor"
ENV{DM_NAME}!="?*", GOTO="device_mapper_end"
# these are temporary devices created by cryptsetup, we want to ignore them
# and also hide them from HAL
ENV{DM_NAME}=="temporary-cryptsetup-*", OPTIONS="ignore_device"
SYMLINK+="disk/by-id/dm-name-$env{DM_NAME}"
ENV{DM_UUID}=="?*", \
SYMLINK+="disk/by-id/dm-uuid-$env{DM_UUID}"
ENV{DM_STATE}=="SUSPENDED", GOTO="device_mapper_end"
# should become ENV{DM_TARGET_TYPES}=="|*error*" after #486780 is fixed
ENV{DM_TARGET_TYPES}=="*error*", GOTO="device_mapper_end"
IMPORT{program}="vol_id --export $tempnode"
OPTIONS+="link_priority=-100"
ENV{DM_TARGET_TYPES}=="*snapshot-origin*", OPTIONS+="link_priority=-90"
ENV{ID_FS_UUID_ENC}=="?*", ENV{ID_FS_USAGE}=="filesystem|other|crypto", \
SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
ENV{ID_FS_LABEL_ENC}=="?*", ENV{ID_FS_USAGE}=="filesystem|other", \
SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"
LABEL="device_mapper_end"
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