File: multipath.rules

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multipath-tools 0.8.5-1
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# Set DM_MULTIPATH_DEVICE_PATH if the device should be handled by multipath
SUBSYSTEM!="block", GOTO="end_mpath"
KERNEL!="sd*|dasd*|nvme*", GOTO="end_mpath"
ACTION=="remove", TEST=="/dev/shm/multipath/find_multipaths/$major:$minor", \
	RUN+="/bin/rm -f /dev/shm/multipath/find_multipaths/$major:$minor"
ACTION!="add|change", GOTO="end_mpath"

IMPORT{cmdline}="nompath"
ENV{nompath}=="?*", GOTO="end_mpath"
IMPORT{cmdline}="multipath"
ENV{multipath}=="off", GOTO="end_mpath"

ENV{DEVTYPE}!="partition", GOTO="test_dev"
IMPORT{parent}="DM_MULTIPATH_DEVICE_PATH"
ENV{DM_MULTIPATH_DEVICE_PATH}=="1", ENV{ID_FS_TYPE}="none", \
	ENV{SYSTEMD_READY}="0"
GOTO="end_mpath"

LABEL="test_dev"

ENV{MPATH_SBIN_PATH}="/sbin"
TEST!="$env{MPATH_SBIN_PATH}/multipath", ENV{MPATH_SBIN_PATH}="/usr/sbin"

# FIND_MULTIPATHS_WAIT_UNTIL is the timeout (in seconds after the
# epoch).
IMPORT{db}="FIND_MULTIPATHS_WAIT_UNTIL"
ENV{.SAVED_FM_WAIT_UNTIL}="$env{FIND_MULTIPATHS_WAIT_UNTIL}"

# multipath -u needs to know if this device has ever been exported
IMPORT{db}="DM_MULTIPATH_DEVICE_PATH"

# multipath -u sets DM_MULTIPATH_DEVICE_PATH and,
# if "find_multipaths smart", also FIND_MULTIPATHS_WAIT_UNTIL.
IMPORT{program}="$env{MPATH_SBIN_PATH}/multipath -u %k"

# case 1: this is definitely multipath
ENV{DM_MULTIPATH_DEVICE_PATH}=="1", \
	ENV{ID_FS_TYPE}="mpath_member", ENV{SYSTEMD_READY}="0", \
	GOTO="stop_wait"

# case 2: this is definitely not multipath, or timeout has expired
ENV{DM_MULTIPATH_DEVICE_PATH}!="2", \
	GOTO="stop_wait"

# Code below here is only run in "smart" mode.
# multipath -u has indicated this is "maybe" multipath.

# Note that DM_MULTIPATH_DEVICE_PATH has the value 2 at this point.
# This value will never propagate to other rules files, because
# it will be reset to 1 in the "pretend_multipath" section below.

# This shouldn't happen, just in case.
ENV{FIND_MULTIPATHS_WAIT_UNTIL}!="?*", GOTO="end_mpath"

# Be careful not to start the timer twice.
ACTION!="add", GOTO="pretend_mpath"
ENV{.SAVED_FM_WAIT_UNTIL}=="?*", GOTO="pretend_mpath"

# At this point, we are seeing this path for the first time, and it's "maybe" multipath.

# The actual start command for the timer.
#
# The purpose of this command is only to make sure we will receive another
# uevent eventually. *Any* uevent may cause waiting to finish if it either ends
# in case 1-3 above, or if it arrives after FIND_MULTIPATHS_WAIT_UNTIL.
#
# Note that this will try to activate multipathd if it isn't running yet.
# If that fails, the unit starts and expires nonetheless. If multipathd
# startup needs to wait for other services, this wait time will add up with
# the --on-active timeout.
#
# We must trigger an "add" event because LVM2 will only act on those.

RUN+="/usr/bin/systemd-run --unit=cancel-multipath-wait-$kernel --description 'cancel waiting for multipath siblings of $kernel' --no-block --timer-property DefaultDependencies=no --timer-property Conflicts=shutdown.target --timer-property Before=shutdown.target --timer-property AccuracySec=500ms --property DefaultDependencies=no --property Conflicts=shutdown.target --property Before=shutdown.target --property Wants=multipathd.service --property After=multipathd.service --on-active=$env{FIND_MULTIPATHS_WAIT_UNTIL} /bin/udevadm trigger --action=add $sys$devpath"

LABEL="pretend_mpath"
ENV{DM_MULTIPATH_DEVICE_PATH}="1"
ENV{SYSTEMD_READY}="0"
GOTO="end_mpath"

LABEL="stop_wait"
# If timeout hasn't expired but we're not in "maybe" state any more, stop timer
# Do this only once, and only if the timer has been started before
IMPORT{db}="FIND_MULTIPATHS_WAIT_CANCELLED"
ENV{FIND_MULTIPATHS_WAIT_CANCELLED}!="?*", \
	ENV{FIND_MULTIPATHS_WAIT_UNTIL}=="?*", \
	ENV{FIND_MULTIPATHS_WAIT_UNTIL}!="0", \
	ENV{FIND_MULTIPATHS_WAIT_CANCELLED}="1", \
	RUN+="/bin/systemctl stop cancel-multipath-wait-$kernel.timer"

LABEL="end_mpath"