core-agent-linux/misc/qubes_block.rules

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# Expose all (except xen-frontend) block devices via xenstore
# Only block devices are interesting
SUBSYSTEM!="block", GOTO="qubes_block_end"
# Skip xen-blkfront devices
ENV{MAJOR}=="202", GOTO="qubes_block_end"
# Skip device-mapper devices
ENV{MAJOR}=="253", GOTO="qubes_block_end"
IMPORT{db}="QUBES_EXPOSED"
ACTION=="add", IMPORT{program}="/usr/lib/qubes/block_add_change"
ACTION=="change", IMPORT{program}="/usr/lib/qubes/block_add_change"
ACTION=="remove", RUN+="/usr/lib/qubes/block_remove"
LABEL="qubes_block_end"
# Cleanup disconnected frontend from xenstore
ACTION=="remove", SUBSYSTEM=="block", ENV{MAJOR}=="202", RUN+="/usr/lib/qubes/block_cleanup"