178 lines
4.5 KiB
Bash
Executable File
178 lines
4.5 KiB
Bash
Executable File
#!/bin/sh
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#
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# Turn off/on the VDEV's enclosure fault LEDs when the pool's state changes.
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#
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# Turn the VDEV's fault LED on if it becomes FAULTED, DEGRADED or UNAVAIL.
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# Turn the LED off when it's back ONLINE again.
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#
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# This script run in two basic modes:
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#
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# 1. If $ZEVENT_VDEV_ENC_SYSFS_PATH and $ZEVENT_VDEV_STATE_STR are set, then
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# only set the LED for that particular VDEV. This is the case for statechange
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# events and some vdev_* events.
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#
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# 2. If those vars are not set, then check the state of all VDEVs in the pool
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# and set the LEDs accordingly. This is the case for pool_import events.
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#
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# Note that this script requires that your enclosure be supported by the
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# Linux SCSI enclosure services (ses) driver. The script will do nothing
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# if you have no enclosure, or if your enclosure isn't supported.
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#
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# Exit codes:
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# 0: enclosure led successfully set
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# 1: enclosure leds not available
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# 2: enclosure leds administratively disabled
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# 3: The led sysfs path passed from ZFS does not exist
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# 4: $ZPOOL not set
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# 5: awk is not installed
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[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
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. "${ZED_ZEDLET_DIR}/zed-functions.sh"
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if [ ! -d /sys/class/enclosure ] ; then
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exit 1
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fi
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if [ "${ZED_USE_ENCLOSURE_LEDS}" != "1" ] ; then
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exit 2
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fi
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zed_check_cmd "$ZPOOL" || exit 4
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zed_check_cmd awk || exit 5
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# Global used in set_led debug print
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vdev=""
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# check_and_set_led (file, val)
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#
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# Read an enclosure sysfs file, and write it if it's not already set to 'val'
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#
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# Arguments
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# file: sysfs file to set (like /sys/class/enclosure/0:0:1:0/SLOT 10/fault)
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# val: value to set it to
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#
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# Return
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# 0 on success, 3 on missing sysfs path
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#
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check_and_set_led()
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{
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file="$1"
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val="$2"
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if [ ! -e "$file" ] ; then
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return 3
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fi
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# If another process is accessing the LED when we attempt to update it,
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# the update will be lost so retry until the LED actually changes or we
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# timeout.
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for _ in $(seq 1 5); do
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# We want to check the current state first, since writing to the
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# 'fault' entry always causes a SES command, even if the
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# current state is already what you want.
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current=$(cat "${file}")
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# On some enclosures if you write 1 to fault, and read it back,
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# it will return 2. Treat all non-zero values as 1 for
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# simplicity.
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if [ "$current" != "0" ] ; then
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current=1
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fi
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if [ "$current" != "$val" ] ; then
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echo "$val" > "$file"
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zed_log_msg "vdev $vdev set '$file' LED to $val"
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else
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break
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fi
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done
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}
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state_to_val()
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{
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state="$1"
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if [ "$state" = "FAULTED" ] || [ "$state" = "DEGRADED" ] || \
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[ "$state" = "UNAVAIL" ] ; then
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echo 1
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elif [ "$state" = "ONLINE" ] ; then
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echo 0
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fi
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}
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# process_pool ([pool])
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#
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# Iterate through a pool (or pools) and set the VDEV's enclosure slot LEDs to
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# the VDEV's state.
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#
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# Arguments
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# pool: Optional pool name. If not specified, iterate though all pools.
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#
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# Return
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# 0 on success, 3 on missing sysfs path
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#
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process_pool()
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{
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pool="$1"
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rc=0
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# Lookup all the current LED values and paths in parallel
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#shellcheck disable=SC2016
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cmd='echo led_token=$(cat "$VDEV_ENC_SYSFS_PATH/fault"),"$VDEV_ENC_SYSFS_PATH",'
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out=$($ZPOOL status -vc "$cmd" "$pool" | grep 'led_token=')
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#shellcheck disable=SC2034
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echo "$out" | while read -r vdev state read write chksum therest; do
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# Read out current LED value and path
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tmp=$(echo "$therest" | sed 's/^.*led_token=//g')
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vdev_enc_sysfs_path=$(echo "$tmp" | awk -F ',' '{print $2}')
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current_val=$(echo "$tmp" | awk -F ',' '{print $1}')
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if [ "$current_val" != "0" ] ; then
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current_val=1
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fi
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if [ -z "$vdev_enc_sysfs_path" ] ; then
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# Skip anything with no sysfs LED entries
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continue
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fi
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if [ ! -e "$vdev_enc_sysfs_path/fault" ] ; then
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#shellcheck disable=SC2030
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rc=1
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zed_log_msg "vdev $vdev '$file/fault' doesn't exist"
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continue;
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fi
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val=$(state_to_val "$state")
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if [ "$current_val" = "$val" ] ; then
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# LED is already set correctly
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continue;
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fi
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if ! check_and_set_led "$vdev_enc_sysfs_path/fault" "$val"; then
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rc=1
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fi
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done
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#shellcheck disable=SC2031
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if [ "$rc" = "0" ] ; then
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return 0
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else
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# We didn't see a sysfs entry that we wanted to set
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return 3
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fi
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}
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if [ -n "$ZEVENT_VDEV_ENC_SYSFS_PATH" ] && [ -n "$ZEVENT_VDEV_STATE_STR" ] ; then
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# Got a statechange for an individual VDEV
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val=$(state_to_val "$ZEVENT_VDEV_STATE_STR")
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vdev=$(basename "$ZEVENT_VDEV_PATH")
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check_and_set_led "$ZEVENT_VDEV_ENC_SYSFS_PATH/fault" "$val"
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else
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# Process the entire pool
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poolname=$(zed_guid_to_pool "$ZEVENT_POOL_GUID")
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process_pool "$poolname"
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fi
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