#!/bin/bash

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# Script to rescan SCSI bus, using the scsi add-single-device mechanism.

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# (c) 1998--2010 Kurt Garloff <kurt@garloff.de>, GNU GPL v2 or v3

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# (c) 2006--2018 Hannes Reinecke, GNU GPL v2 or later

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# $Id: rescan-scsi-bus.sh,v 1.57 2012/03/31 14:08:48 garloff Exp $

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VERSION="20180615"

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SCAN_WILD_CARD=4294967295

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setcolor ()

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{

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red="\e[0;31m"

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green="\e[0;32m"

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yellow="\e[0;33m"

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bold="\e[0;1m"

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norm="\e[0;0m"

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}

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unsetcolor ()

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{

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red=""; green=""

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yellow=""; norm=""

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}

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echo_debug()

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{

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if [ $debug -eq 1 ] ; then

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echo "$1"

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fi

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}

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# Output some text and return cursor to previous position

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# (only works for simple strings)

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# Stores length of string in LN and returns it

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print_and_scroll_back ()

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{

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STRG="$1"

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LN=${#STRG}

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BK=""

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declare -i cntr=0

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while test $cntr -lt $LN; do BK="$BK\e[D"; let cntr+=1; done

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echo -en "$STRG$BK"

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return $LN

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}

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# Overwrite a text of length $LN with whitespace

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white_out ()

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{

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BK=""; WH=""

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declare -i cntr=0

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while test $cntr -lt $LN; do BK="$BK\e[D"; WH="$WH "; let cntr+=1; done

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echo -en "$WH$BK"

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}

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# Return hosts. sysfs must be mounted

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findhosts_26 ()

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{

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hosts=`find /sys/class/scsi_host/host* -maxdepth 4 -type d -o -type l 2> /dev/null | awk -F'/' '{print $5}' | sed -e 's~host~~' | sort -nu`

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scsi_host_data=`echo "$hosts" | sed -e 's~^~/sys/class/scsi_host/host~'`

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for hostdir in $scsi_host_data; do

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hostno=${hostdir#/sys/class/scsi_host/host}

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if [ -f $hostdir/isp_name ] ; then

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hostname="qla2xxx"

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elif [ -f $hostdir/lpfc_drvr_version ] ; then

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hostname="lpfc"

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else

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hostname=`cat $hostdir/proc_name`

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fi

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#hosts="$hosts $hostno"

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echo_debug "Host adapter $hostno ($hostname) found."

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done

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if [ -z "$hosts" ] ; then

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echo "No SCSI host adapters found in sysfs"

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exit 1;

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fi

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# Not necessary just use double quotes around variable to preserve new lines

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#hosts=`echo $hosts | tr ' ' '\n'`

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}

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# Return hosts. /proc/scsi/HOSTADAPTER/? must exist

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findhosts ()

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{

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hosts=

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for driverdir in /proc/scsi/*; do

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driver=${driverdir#/proc/scsi/}

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if test $driver = scsi -o $driver = sg -o $driver = dummy -o $driver = device_info; then continue; fi

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for hostdir in $driverdir/*; do

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name=${hostdir#/proc/scsi/*/}

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if test $name = add_map -o $name = map -o $name = mod_parm; then continue; fi

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num=$name

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driverinfo=$driver

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if test -r "$hostdir/status"; then

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num=$(printf '%d\n' "$(sed -n 's/SCSI host number://p' "$hostdir/status")")

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driverinfo="$driver:$name"

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fi

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hosts="$hosts $num"

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echo "Host adapter $num ($driverinfo) found."

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done

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done

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}

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printtype ()

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{

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local type=$1

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case "$type" in

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0) echo "Direct-Access" ;;

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1) echo "Sequential-Access" ;;

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2) echo "Printer" ;;

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3) echo "Processor" ;;

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4) echo "WORM" ;;

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5) echo "CD-ROM" ;;

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6) echo "Scanner" ;;

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7) echo "Optical-Device" ;;

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8) echo "Medium-Changer" ;;

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9) echo "Communications" ;;

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10) echo "Unknown" ;;

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11) echo "Unknown" ;;

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12) echo "RAID" ;;

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13) echo "Enclosure" ;;

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14) echo "Direct-Access-RBC" ;;

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*) echo "Unknown" ;;

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esac

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}

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print02i()

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{

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if [ "$1" = "*" ] ; then

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echo "00"

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else

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printf "%02i" "$1"

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fi

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}

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# Get /proc/scsi/scsi info for device $host:$channel:$id:$lun

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# Optional parameter: Number of lines after first (default = 2),

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# result in SCSISTR, return code 1 means empty.

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procscsiscsi ()

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{

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if test -z "$1"; then LN=2; else LN=$1; fi

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CHANNEL=`print02i "$channel"`

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ID=`print02i "$id"`

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LUN=`print02i "$lun"`

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if [ -d /sys/class/scsi_device ]; then

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SCSIPATH="/sys/class/scsi_device/${host}:${channel}:${id}:${lun}"

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if [ -d "$SCSIPATH" ] ; then

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SCSISTR="Host: scsi${host} Channel: $CHANNEL Id: $ID Lun: $LUN"

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if [ "$LN" -gt 0 ] ; then

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IVEND=$(cat ${SCSIPATH}/device/vendor)

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IPROD=$(cat ${SCSIPATH}/device/model)

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IPREV=$(cat ${SCSIPATH}/device/rev)

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SCSIDEV=$(printf ' Vendor: %-08s Model: %-16s Rev: %-4s' "$IVEND" "$IPROD" "$IPREV")

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SCSISTR="$SCSISTR

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$SCSIDEV"

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fi

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if [ "$LN" -gt 1 ] ; then

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ILVL=$(cat ${SCSIPATH}/device/scsi_level)

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type=$(cat ${SCSIPATH}/device/type)

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ITYPE=$(printtype $type)

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SCSITMP=$(printf ' Type: %-17s ANSI SCSI revision: %02d' "$ITYPE" "$((ILVL - 1))")

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SCSISTR="$SCSISTR

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$SCSITMP"

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fi

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else

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return 1

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fi

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else

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grepstr="scsi$host Channel: $CHANNEL Id: $ID Lun: $LUN"

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SCSISTR=$(grep -A "$LN" -e "$grepstr" /proc/scsi/scsi)

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fi

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if test -z "$SCSISTR"; then return 1; else return 0; fi

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}

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# Find sg device with 2.6 sysfs support

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sgdevice26 ()

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{

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local gendev

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gendev=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/generic

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if test -e "$gendev"; then

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SGDEV=$(basename "$(readlink "$gendev")")

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else

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for SGDEV in /sys/class/scsi_generic/sg*; do

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DEV=`readlink $SGDEV/device`

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if test "${DEV##*/}" = "$host:$channel:$id:$lun"; then

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SGDEV=`basename $SGDEV`; return

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fi

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done

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SGDEV=""

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fi

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}

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# Find sg device with 2.4 report-devs extensions

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sgdevice24 ()

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{

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if procscsiscsi 3; then

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SGDEV=`echo "$SCSISTR" | grep 'Attached drivers:' | sed 's/^ *Attached drivers: \(sg[0-9]*\).*/\1/'`

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fi

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}

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# Find sg device that belongs to SCSI device $host $channel $id $lun

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# and return in SGDEV

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sgdevice ()

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{

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SGDEV=

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if test -d /sys/class/scsi_device; then

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sgdevice26

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else

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DRV=`grep 'Attached drivers:' /proc/scsi/scsi 2>/dev/null`

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repdevstat=$((1-$?))

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if [ $repdevstat = 0 ]; then

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echo "scsi report-devs 1" >/proc/scsi/scsi

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DRV=`grep 'Attached drivers:' /proc/scsi/scsi 2>/dev/null`

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if [ $? = 1 ]; then return; fi

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fi

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if ! echo "$DRV" | grep -q 'drivers: sg'; then

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modprobe sg

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fi

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sgdevice24

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if [ $repdevstat = 0 ]; then

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echo "scsi report-devs 0" >/proc/scsi/scsi

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fi

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fi

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}

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# Whether or not the RMB (removable) bit has been set in the INQUIRY response.

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# Uses ${host}, ${channel}, ${id} and ${lun}. Assumes that sg_device() has

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# already been called. How to test this function: copy/paste this function

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# in a shell and run

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# (cd /sys/class/scsi_device && for d in *; do set ${d//:/ }; echo -n "$d $(</sys/class/scsi_device/${d}/device/block/*/removable) <> "; SGDEV=bsg/$d host=$1 channel=$2 id=$3 lun=$4 is_removable; done)

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is_removable ()

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{

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local b p

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p=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/inquiry

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# Extract the second byte of the INQUIRY response and check bit 7 (mask 0x80).

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b=$(od -tx1 -j1 -N1 "$p" 2>/dev/null |

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{ read -r _ byte rest; echo -n "$byte"; })

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if [ -n "$b" ]; then

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echo $(((0x$b & 0x80) != 0))

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else

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sg_inq /dev/$SGDEV 2>/dev/null | sed -n 's/^.*RMB=\([0-9]*\).*$/\1/p'

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fi

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}

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# Test if SCSI device is still responding to commands

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# Return values:

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# 0 device is present

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# 1 device has changed

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# 2 device has been removed

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testonline ()

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{

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local ctr RC RMB

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: testonline

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ctr=0

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RC=0

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# Set default values

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IPTYPE=31

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IPQUAL=3

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if test ! -x /usr/bin/sg_turs; then return 0; fi

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sgdevice

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if test -z "$SGDEV"; then return 0; fi

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sg_turs /dev/$SGDEV >/dev/null 2>&1

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RC=$?

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# Handle in progress of becoming ready and unit attention

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while test $RC = 2 -o $RC = 6 && test $ctr -le 30; do

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if test $RC = 2 -a "$RMB" != "1"; then echo -n "."; let LN+=1; sleep 1

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else sleep 0.02; fi

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let ctr+=1

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sg_turs /dev/$SGDEV >/dev/null 2>&1

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RC=$?

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# Check for removable device; TEST UNIT READY obviously will

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# fail for a removable device with no medium

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RMB=$(is_removable)

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print_and_scroll_back "$host:$channel:$id:$lun $SGDEV ($RMB) "

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test $RC = 2 -a "$RMB" = "1" && break

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done

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if test $ctr != 0; then white_out; fi

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# echo -e "\e[A\e[A\e[A${yellow}Test existence of $SGDEV = $RC ${norm} \n\n\n"

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if test $RC = 1; then return $RC; fi

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# Reset RC (might be !=0 for passive paths)

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RC=0

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# OK, device online, compare INQUIRY string

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INQ=`sg_inq $sg_len_arg /dev/$SGDEV 2>/dev/null`

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if [ -z "$INQ" ] ; then

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echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}INQUIRY failed${norm} \n\n\n"

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return 2

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fi

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IVEND=`echo "$INQ" | grep 'Vendor identification:' | sed 's/^[^:]*: \(.*\)$/\1/'`

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IPROD=`echo "$INQ" | grep 'Product identification:' | sed 's/^[^:]*: \(.*\)$/\1/'`

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IPREV=`echo "$INQ" | grep 'Product revision level:' | sed 's/^[^:]*: \(.*\)$/\1/'`

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STR=`printf " Vendor: %-08s Model: %-16s Rev: %-4s" "$IVEND" "$IPROD" "$IPREV"`

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IPTYPE=`echo "$INQ" | sed -n 's/.* Device_type=\([0-9]*\) .*/\1/p'`

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IPQUAL=`echo "$INQ" | sed -n 's/ *PQual=\([0-9]*\) Device.*/\1/p'`

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if [ "$IPQUAL" != 0 ] ; then

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[ -z "$IPQUAL" ] && IPQUAL=3

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[ -z "$IPTYPE" ] && IPTYPE=31

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echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}LU not available (PQual $IPQUAL)${norm} \n\n\n"

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return 2

[300] Fix | Delete

fi

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TYPE=$(printtype $IPTYPE)

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if ! procscsiscsi ; then

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echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV removed.\n\n\n"

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return 2

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fi

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TMPSTR=`echo "$SCSISTR" | grep 'Vendor:'`

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if test $ignore_rev -eq 0 ; then

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if [ "$TMPSTR" != "$STR" ]; then

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echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${SCSISTR#* } \nto: $STR ${norm} \n\n\n"

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return 1

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fi

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else

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# Ignore disk revision change

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local old_str_no_rev

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old_str_no_rev=`echo "$TMPSTR" | sed -e 's/.\{4\}$//'`

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local new_str_no_rev

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new_str_no_rev=`echo "$STR" | sed -e 's/.\{4\}$//'`

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if [ "$old_str_no_rev" != "$new_str_no_rev" ]; then

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echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${SCSISTR#* } \nto: $STR ${norm} \n\n\n"

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return 1

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fi

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fi

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TMPSTR=`echo "$SCSISTR" | sed -n 's/.*Type: *\(.*\) *ANSI.*/\1/p' | sed 's/ *$//g'`

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if [ "$TMPSTR" != "$TYPE" ] ; then

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echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${TMPSTR} \nto: $TYPE ${norm} \n\n\n"

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return 1

[328] Fix | Delete

fi

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return $RC

[330] Fix | Delete

}

[331] Fix | Delete

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# Test if SCSI device $host $channel $id $lun exists

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# Outputs description from /proc/scsi/scsi (unless arg passed)

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# Returns SCSISTR (empty if no dev)

[335] Fix | Delete

testexist ()

[336] Fix | Delete

{

[337] Fix | Delete

: testexist

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SCSISTR=

[339] Fix | Delete

if procscsiscsi && test -z "$1"; then

[340] Fix | Delete

echo "$SCSISTR" | head -n1

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echo "$SCSISTR" | tail -n2 | pr -o4 -l1

[342] Fix | Delete

fi

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}

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# Returns the list of existing channels per host

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chanlist ()

[347] Fix | Delete

{

[348] Fix | Delete

local hcil

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local cil

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local chan

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local tmpchan

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for dev in /sys/class/scsi_device/${host}:* ; do

[354] Fix | Delete

[ -d $dev ] || continue;

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hcil=${dev##*/}

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cil=${hcil#*:}

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chan=${cil%%:*}

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for tmpchan in $channelsearch ; do

[359] Fix | Delete

if test "$chan" -eq $tmpchan ; then

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chan=

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fi

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done

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if test -n "$chan" ; then

[364] Fix | Delete

channelsearch="$channelsearch $chan"

[365] Fix | Delete

fi

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done

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if test -z "$channelsearch"; then channelsearch="0"; fi

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}

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# Returns the list of existing targets per host

[371] Fix | Delete

idlist ()

[372] Fix | Delete

{

[373] Fix | Delete

local tmpid

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local newid

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local oldid

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oldlist=$(ls /sys/class/scsi_device/ | sed -n "s/${host}:${channel}:\([0-9]*:[0-9]*\)/\1/p" | uniq)

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# Rescan LUN 0 to check if we found new targets

[379] Fix | Delete

echo "${channel} - 0" > /sys/class/scsi_host/host${host}/scan

[380] Fix | Delete

newlist=$(ls /sys/class/scsi_device/ | sed -n "s/${host}:${channel}:\([0-9]*:[0-9]*\)/\1/p" | uniq)

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for newid in $newlist ; do

[382] Fix | Delete

oldid=$newid

[383] Fix | Delete

for tmpid in $oldlist ; do

[384] Fix | Delete

if test $newid = $tmpid ; then

[385] Fix | Delete

oldid=

[386] Fix | Delete

break

[387] Fix | Delete

fi

[388] Fix | Delete

done

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if test -n "$oldid" ; then

[390] Fix | Delete

id=${oldid%%:*}

[391] Fix | Delete

lun=${oldid##*:}

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dev=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}

[393] Fix | Delete

if [ -d $dev ] ; then

[394] Fix | Delete

hcil=${dev##*/}

[395] Fix | Delete

printf "\r${green}NEW: $norm"

[396] Fix | Delete

testexist

[397] Fix | Delete

if test "$SCSISTR" ; then

[398] Fix | Delete

incrfound "$hcil"

[399] Fix | Delete

fi

[400] Fix | Delete

fi

[401] Fix | Delete

fi

[402] Fix | Delete

done

[403] Fix | Delete

idsearch=$(ls /sys/class/scsi_device/ | sed -n "s/${host}:${channel}:\([0-9]*\):[0-9]*/\1/p" | uniq)

[404] Fix | Delete

}

[405] Fix | Delete

[406] Fix | Delete

# Returns the list of existing LUNs from device $host $channel $id $lun

[407] Fix | Delete

# and returns list to stdout

[408] Fix | Delete

getluns()

[409] Fix | Delete

{

[410] Fix | Delete

sgdevice

[411] Fix | Delete

if test -z "$SGDEV"; then return 1; fi

[412] Fix | Delete

if test ! -x /usr/bin/sg_luns; then echo 0; return 1; fi

[413] Fix | Delete

LLUN=`sg_luns /dev/$SGDEV 2>/dev/null | sed -n 's/ \(.*\)/\1/p'`

[414] Fix | Delete

# Added -z $LLUN condition because $? gets the RC from sed, not sg_luns

[415] Fix | Delete

if test $? != 0 -o -z "$LLUN"; then echo 0; return 1; fi

[416] Fix | Delete

for lun in $LLUN ; do

[417] Fix | Delete

# Swap LUN number

[418] Fix | Delete

l0=0x$lun

[419] Fix | Delete

l1=$(( ($l0 >> 48) & 0xffff ))

[420] Fix | Delete

l2=$(( ($l0 >> 32) & 0xffff ))

[421] Fix | Delete

l3=$(( ($l0 >> 16) & 0xffff ))

[422] Fix | Delete

l4=$(( $l0 & 0xffff ))

[423] Fix | Delete

l0=$(( ( ( ($l4 * 0xffff) + $l3 ) * 0xffff + $l2 ) * 0xffff + $l1 ))

[424] Fix | Delete

printf "%u\n" $l0

[425] Fix | Delete

done

[426] Fix | Delete

return 0

[427] Fix | Delete

}

[428] Fix | Delete

[429] Fix | Delete

# Wait for udev to settle (create device nodes etc.)

[430] Fix | Delete

udevadm_settle()

[431] Fix | Delete

{

[432] Fix | Delete

local tmo=60

[433] Fix | Delete

if test -x /sbin/udevadm; then

[434] Fix | Delete

print_and_scroll_back " Calling udevadm settle (can take a while) "

[435] Fix | Delete

# Loop for up to 60 seconds if sd devices still are settling..

[436] Fix | Delete

# This allows us to continue if udev events are stuck on multipaths in recovery mode

[437] Fix | Delete

while [ $tmo -gt 0 ] ; do

[438] Fix | Delete

if ! /sbin/udevadm settle --timeout=1 | egrep -q sd[a-z]+ ; then

[439] Fix | Delete

break;

[440] Fix | Delete

fi

[441] Fix | Delete

let tmo=$tmo-1

[442] Fix | Delete

done

[443] Fix | Delete

white_out

[444] Fix | Delete

elif test -x /sbin/udevsettle; then

[445] Fix | Delete

print_and_scroll_back " Calling udevsettle (can take a while) "

[446] Fix | Delete

/sbin/udevsettle

[447] Fix | Delete

white_out

[448] Fix | Delete

else

[449] Fix | Delete

sleep 0.02

[450] Fix | Delete

fi

[451] Fix | Delete

}

[452] Fix | Delete

[453] Fix | Delete

# Perform scan on a single lun $host $channel $id $lun

[454] Fix | Delete

dolunscan()

[455] Fix | Delete

{

[456] Fix | Delete

local remappedlun0=

[457] Fix | Delete

SCSISTR=

[458] Fix | Delete

devnr="$host $channel $id $lun"

[459] Fix | Delete

echo -e " Scanning for device $devnr ... "

[460] Fix | Delete

printf "${yellow}OLD: $norm"

[461] Fix | Delete

testexist

[462] Fix | Delete

# Device exists: Test whether it's still online

[463] Fix | Delete

# (testonline returns 2 if it's gone and 1 if it has changed)

[464] Fix | Delete

if test "$SCSISTR" ; then

[465] Fix | Delete

testonline

[466] Fix | Delete

RC=$?

[467] Fix | Delete

# Well known lun transition case. Only for Direct-Access devs (type 0)

[468] Fix | Delete

# If block directory exists && and PQUAL != 0, we unmapped lun0 and just have a well-known lun

[469] Fix | Delete

# If block directory doesn't exist && PQUAL == 0, we mapped a real lun0

[470] Fix | Delete

if test $lun -eq 0 -a $IPTYPE -eq 0 ; then

[471] Fix | Delete

if test $RC = 2 ; then

[472] Fix | Delete

if test -e /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device; then

[473] Fix | Delete

if test -d /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/block ; then

[474] Fix | Delete

remappedlun0=2 # Transition from real lun 0 to well-known

[475] Fix | Delete

else

[476] Fix | Delete

RC=0 # Set this so the system leaves the existing well known lun alone. This is a lun 0 with no block directory

[477] Fix | Delete

fi

[478] Fix | Delete

fi

[479] Fix | Delete

elif test $RC = 0 -a $IPTYPE -eq 0; then

[480] Fix | Delete

if test -e /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device; then

[481] Fix | Delete

if test ! -d /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/block ; then

[482] Fix | Delete

remappedlun0=1 # Transition from well-known to real lun 0

[483] Fix | Delete

fi

[484] Fix | Delete

fi

[485] Fix | Delete

fi

[486] Fix | Delete

fi

[487] Fix | Delete

fi

[488] Fix | Delete

[489] Fix | Delete

# Special case: lun 0 just got added (for reportlunscan),

[490] Fix | Delete

# so make sure we correctly treat it as new

[491] Fix | Delete

if test "$lun" = "0" -a "$1" = "1" -a -z "$remappedlun0"; then

[492] Fix | Delete

SCSISTR=""

[493] Fix | Delete

printf "\r\e[A\e[A\e[A"

[494] Fix | Delete

fi

[495] Fix | Delete

[496] Fix | Delete

: f $remove s $SCSISTR

[497] Fix | Delete

if test "$remove" -a "$SCSISTR" -o "$remappedlun0" = "1"; then

[498] Fix | Delete

if test $RC != 0 -o ! -z "$forceremove" -o -n "$remappedlun0"; then

[499] Fix | Delete