1 files changed, 88 insertions, 0 deletions
diff --git a/cmd/zed/zed.d/statechange-led.sh b/cmd/zed/zed.d/statechange-led.sh
new file mode 100755
index 000000000..ca911d2b9
--- /dev/null
+++ b/cmd/zed/zed.d/statechange-led.sh
@@ -0,0 +1,88 @@
+#!/bin/bash
+#
+# Turn off/on the VDEV's enclosure fault LEDs when the pool's state changes.
+#
+# Turn LED on if the VDEV becomes faulted/degraded, and turn it back off when
+# it's healthy again.  This requires that your enclosure be supported by the
+# Linux SCSI enclosure services (ses) driver.  The script will do nothing
+# if you have no enclosure, or if your enclosure isn't supported.
+#
+# This script also requires ZFS to be built with libdevmapper support.
+#
+# Exit codes:
+#   0: enclosure led successfully set
+#   1: enclosure leds not not available
+#   2: enclosure leds administratively disabled
+#   3: ZED built without libdevmapper
+
+[ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
+. "${ZED_ZEDLET_DIR}/zed-functions.sh"
+
+# ZEVENT_VDEV_UPATH will not be present if ZFS is not built with libdevmapper
+[ -n "${ZEVENT_VDEV_UPATH}" ] || exit 3
+
+if [ "${ZED_USE_ENCLOSURE_LEDS}" != "1" ] ; then
+	exit 2
+fi
+
+if [ ! -d /sys/class/enclosure ] ; then
+	exit 1
+fi
+
+# Turn on/off enclosure LEDs
+function led
+{
+	name=$1
+	val=$2
+
+	# We want to check the current state first, since writing to the
+	# 'fault' entry always always causes a SES command, even if the
+	# current state is already what you want.
+	if [ -e /sys/block/$name/device/enclosure_device*/fault ] ; then
+		# We have to do some monkey business to deal with spaces in
+		# enclosure_device names.  I've seen horrible things like this: 
+		#
+		# '/sys/block/sdfw/device/enclosure_device:SLOT 43 41  /fault'
+		#
+		# ...so escape all spaces.
+		file=`ls /sys/block/$name/device/enclosure_device*/fault | sed 's/\s/\\ /g'`
+
+		current=`cat "$file"`
+
+		# On some enclosures if you write 1 to fault, and read it back,
+		# it will return 2.  Treat all non-zero values as 1 for
+		# simplicity.
+		if [ "$current" != "0" ] ; then
+			current=1
+		fi
+
+		if [ "$current" != "$val" ] ; then
+			# Set the value twice.  I've seen enclosures that were
+			# flakey about setting it the first time.
+			echo $val > "$file"
+			echo $val > "$file"
+		fi
+	fi
+}
+
+# Decide whether to turn on/off an LED based on the state
+# Pass in path name and fault string ("ONLINE"/"FAULTED"/"DEGRADED"...etc)
+function process {
+	# path=/dev/sda, fault=
+
+	path=$1
+	fault=$2
+	name=`basename $path`
+
+	if [ -z "$name" ] ; then
+		return
+	fi
+
+	if [ "$fault" == "FAULTED" ] || [ "$fault" == "DEGRADED" ] ; then
+		led $name 1
+	else
+		led $name 0
+	fi
+}
+
+process "$ZEVENT_VDEV_UPATH" "$ZEVENT_VDEV_STATE_STR"