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#!/bin/sh
#
# Show device mapper slave devices. This is useful for looking up the
# /dev/sd* devices associated with a dm or multipath device. For example:
#
# $ ls /sys/block/dm-113/slaves/
# sddt sdjw
#
if [ "$1" = "-h" ] ; then
echo "Show device mapper slave devices."
exit
fi
dev="$VDEV_PATH"
# If the VDEV path is a symlink, resolve it to a real device
if [ -L "$dev" ] ; then
dev=$(readlink "$dev")
fi
dev=$(basename "$dev")
val=""
if [ -d "/sys/class/block/$dev/slaves" ] ; then
# ls -C: output in columns, no newlines
val=$(ls -C "/sys/class/block/$dev/slaves")
# ls -C will print two spaces between files; change to one space.
val=$(echo "$val" | sed -r 's/[[:blank:]]+/ /g')
fi
echo "slaves=$val"
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