#!/bin/sh

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_remove_dm() {

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local dev=$1

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local s

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local devname

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for s in /sys/block/${dev}/holders/dm-* ; do

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[ -e ${s} ] || continue

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_remove_dm ${s##*/}

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done

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# multipath devices might have MD devices on top,

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# which are removed after this script. So do not

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# remove those to avoid spurious errors

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case $(cat /sys/block/${dev}/dm/uuid) in

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mpath-*)

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return 0

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;;

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*)

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devname=$(cat /sys/block/${dev}/dm/name)

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dmsetup -v --noudevsync remove "$devname" || return $?

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;;

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esac

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return 0

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}

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_do_dm_shutdown() {

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local ret=0

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local final=$1

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local dev

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info "Disassembling device-mapper devices"

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for dev in /sys/block/dm-* ; do

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[ -e ${dev} ] || continue

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if [ "x$final" != "x" ]; then

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_remove_dm ${dev##*/} || ret=$?

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else

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_remove_dm ${dev##*/} >/dev/null 2>&1 || ret=$?

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fi

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done

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if [ "x$final" != "x" ]; then

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info "dmsetup ls --tree"

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dmsetup ls --tree 2>&1 | vinfo

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fi

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return $ret

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}

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if command -v dmsetup >/dev/null &&

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[ "x$(dmsetup status)" != "xNo devices found" ]; then

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_do_dm_shutdown $1

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else

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:

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fi

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