multipathd/mpath_id

#!/bin/sh

major=$1
minor=$2

# Check for linear (kpartx) tables first
mptbl=$(/sbin/dmsetup table -j $major -m $minor --target linear)
if [ "$mptbl" ] ; then
    set -- $mptbl
    mpathmajor=${4%%:*}
    mpathminor=${4##*:}
    if [ "$mpathmajor" -ne "$major" ] ; then
	 # Not a device mapper device, exit
	exit 1
    fi
else
    mpathmajor=$major
    mpathminor=$minor
fi

mpstatus=$(/sbin/dmsetup status -j $mpathmajor -m $mpathminor --target multipath)
if [ "$mpstatus" ]; then
    set -- $mpstatus
    while [ $# -gt 0 ] ; do
	: $1
	case $1 in
	    *:*)
		devmajor=${1%%:*}
		devminor=${1##*:}
		line=$(sed -n "/ *$devmajor *$devminor .*/p" /proc/partitions)
		devname=${line##* }
		;;
	esac
	[ "$devname" ] && break
	shift
    done

    case "$devname" in
	dasd*)
	    echo ID_BUS=\"ccw\" ;;
	cciss*)
	    echo ID_BUS=\"cciss\" ;;
	*)
	    echo ID_BUS=\"scsi\" ;;
    esac
else
    # Not a multipath device, exit
    exit 1
fi

mpid=$(/sbin/dmsetup info -c --noopencount --noheadings -o name -j $major -m $minor)

if [ -z "$mpid" ]; then
	exit 1
fi
echo ID_MPATH=\"$mpid\"

exit 0