Linux) Disk Rescan 스크립트 (RHEL 7.X 기본 제공)

RHEL 7.X (CentOS 7.X) Disk Rescan Scripts

 

가끔씩 해당 명령이 안보인다는 분들이 계셔서 스크립트의 내용과 파일을 첨부하여 올립니다.

(CentOS에도 기본으로 제공되니 참고하기 바랍니다.)

 

 

rescan-scsi-bus.sh

0.03MB

 

 

#!/bin/bash
# Skript to rescan SCSI bus, using the 
# scsi add-single-device mechanism
# (c) 1998--2010 Kurt Garloff <kurt@garloff.de>, GNU GPL v2 or v3
# (c) 2006--2013 Hannes Reinecke, GNU GPL v2 or later
# $Id: rescan-scsi-bus.sh,v 1.57 2012/03/31 14:08:48 garloff Exp $

SCAN_WILD_CARD=4294967295

setcolor ()
{
  red="\e[0;31m"
  green="\e[0;32m"
  yellow="\e[0;33m"
  bold="\e[0;1m"
  norm="\e[0;0m"
}

unsetcolor () 
{
  red=""; green=""
  yellow=""; norm=""
}

echo_debug()
{
  if [ $debug -eq 1 ] ; then
     echo "$1"
  fi
}

# Output some text and return cursor to previous position
# (only works for simple strings)
# Stores length of string in LN and returns it
print_and_scroll_back ()
{
  STRG="$1"
  LN=${#STRG}
  BK=""
  declare -i cntr=0
  while test $cntr -lt $LN; do BK="$BK\e[D"; let cntr+=1; done
  echo -en "$STRG$BK"
  return $LN
}

# Overwrite a text of length $1 (fallback to $LN) with whitespace
white_out ()
{
  BK=""; WH=""
  if test -n "$1"; then LN=$1; fi
  declare -i cntr=0
  while test $cntr -lt $LN; do BK="$BK\e[D"; WH="$WH "; let cntr+=1; done
  echo -en "$WH$BK"
}

# Return hosts. sysfs must be mounted
findhosts_26 ()
{
  hosts=`find /sys/class/scsi_host/host* -maxdepth 4 -type d -o -type l 2> /dev/null | awk -F'/' '{print $5}' | sed -e 's~host~~' | sort -nu` 
  scsi_host_data=`echo "$hosts" | sed -e 's~^~/sys/class/scsi_host/host~'` 
  for hostdir in $scsi_host_data; do 
    hostno=${hostdir#/sys/class/scsi_host/host}
    if [ -f $hostdir/isp_name ] ; then
      hostname="qla2xxx"
    elif [ -f $hostdir/lpfc_drvr_version ] ; then
      hostname="lpfc"
    else
      hostname=`cat $hostdir/proc_name`
    fi
    #hosts="$hosts $hostno"
    echo_debug "Host adapter $hostno ($hostname) found."
  done  
  if [ -z "$hosts" ] ; then
    echo "No SCSI host adapters found in sysfs"
    exit 1;
  fi
  # Not necessary just use double quotes around variable to preserve new lines
  #hosts=`echo $hosts | tr ' ' '\n'`
}

# Return hosts. /proc/scsi/HOSTADAPTER/? must exist
findhosts ()
{
  hosts=
  for driverdir in /proc/scsi/*; do
    driver=${driverdir#/proc/scsi/}
    if test $driver = scsi -o $driver = sg -o $driver = dummy -o $driver = device_info; then continue; fi
    for hostdir in $driverdir/*; do
      name=${hostdir#/proc/scsi/*/}
      if test $name = add_map -o $name = map -o $name = mod_parm; then continue; fi
      num=$name
      driverinfo=$driver
      if test -r $hostdir/status; then
	num=$(printf '%d\n' `sed -n 's/SCSI host number://p' $hostdir/status`)
	driverinfo="$driver:$name"
      fi
      hosts="$hosts $num"
      echo "Host adapter $num ($driverinfo) found."
    done
  done
}

printtype ()
{
  local type=$1

  case "$type" in
    0) echo "Direct-Access    " ;;
    1) echo "Sequential-Access" ;;
    2) echo "Printer          " ;;
    3) echo "Processor        " ;;
    4) echo "WORM             " ;;
    5) echo "CD-ROM           " ;;
    6) echo "Scanner          " ;;
    7) echo "Optical Device   " ;;
    8) echo "Medium Changer   " ;;
    9) echo "Communications   " ;;
    10) echo "Unknown          " ;;
    11) echo "Unknown          " ;;
    12) echo "RAID             " ;;
    13) echo "Enclosure        " ;;
    14) echo "Direct-Access-RBC" ;;
    *) echo "Unknown          " ;;
  esac
}

print02i()
{
    if [ "$1" = "*" ] ; then 
        echo "00"
    else
        printf "%02i" "$1"
    fi
}

# Get /proc/scsi/scsi info for device $host:$channel:$id:$lun
# Optional parameter: Number of lines after first (default = 2), 
# result in SCSISTR, return code 1 means empty.
procscsiscsi ()
{  
  if test -z "$1"; then LN=2; else LN=$1; fi
  CHANNEL=`print02i "$channel"`
  ID=`print02i "$id"`
  LUN=`print02i "$lun"`
  if [ -d /sys/class/scsi_device ]; then
    SCSIPATH="/sys/class/scsi_device/${host}:${channel}:${id}:${lun}"
    if [ -d  "$SCSIPATH" ] ; then
      SCSISTR="Host: scsi${host} Channel: $CHANNEL Id: $ID Lun: $LUN"
      if [ "$LN" -gt 0 ] ; then
	IVEND=$(cat ${SCSIPATH}/device/vendor)
	IPROD=$(cat ${SCSIPATH}/device/model)
	IPREV=$(cat ${SCSIPATH}/device/rev)
	SCSIDEV=$(printf '  Vendor: %-08s Model: %-16s Rev: %-4s' "$IVEND" "$IPROD" "$IPREV")
	SCSISTR="$SCSISTR
$SCSIDEV"
      fi
      if [ "$LN" -gt 1 ] ; then
	ILVL=$(cat ${SCSIPATH}/device/scsi_level)
	type=$(cat ${SCSIPATH}/device/type)
	ITYPE=$(printtype $type)
	SCSITMP=$(printf '  Type:   %-16s                ANSI SCSI revision: %02d' "$ITYPE" "$((ILVL - 1))")
	SCSISTR="$SCSISTR
$SCSITMP"
      fi
    else
      return 1
    fi
  else
    grepstr="scsi$host Channel: $CHANNEL Id: $ID Lun: $LUN"
    SCSISTR=`cat /proc/scsi/scsi | grep -A$LN -e"$grepstr"`
  fi
  if test -z "$SCSISTR"; then return 1; else return 0; fi
}

# Find sg device with 2.6 sysfs support
sgdevice26 ()
{
  if test -e /sys/class/scsi_device/$host\:$channel\:$id\:$lun/device/generic; then	
    SGDEV=`readlink /sys/class/scsi_device/$host\:$channel\:$id\:$lun/device/generic`
    SGDEV=`basename $SGDEV`
  else
    for SGDEV in /sys/class/scsi_generic/sg*; do
      DEV=`readlink $SGDEV/device`
      if test "${DEV##*/}" = "$host:$channel:$id:$lun"; then
	SGDEV=`basename $SGDEV`; return
      fi
    done
    SGDEV=""
  fi  
}

# Find sg device with 2.4 report-devs extensions
sgdevice24 ()
{
  if procscsiscsi 3; then
    SGDEV=`echo "$SCSISTR" | grep 'Attached drivers:' | sed 's/^ *Attached drivers: \(sg[0-9]*\).*/\1/'`
  fi
}

# Find sg device that belongs to SCSI device $host $channel $id $lun
# and return in SGDEV
sgdevice ()
{
  SGDEV=
  if test -d /sys/class/scsi_device; then
    sgdevice26
  else  
    DRV=`grep 'Attached drivers:' /proc/scsi/scsi 2>/dev/null`
    repdevstat=$((1-$?))
    if [ $repdevstat = 0 ]; then
      echo "scsi report-devs 1" >/proc/scsi/scsi
      DRV=`grep 'Attached drivers:' /proc/scsi/scsi 2>/dev/null`
      if [ $? = 1 ]; then return; fi
    fi
    if ! `echo $DRV | grep 'drivers: sg' >/dev/null`; then
      modprobe sg
    fi
    sgdevice24
    if [ $repdevstat = 0 ]; then
      echo "scsi report-devs 0" >/proc/scsi/scsi
    fi
  fi
}

# Test if SCSI device is still responding to commands
# Return values:
#   0 device is present
#   1 device has changed
#   2 device has been removed
testonline ()
{
  : testonline
  RC=0
  if test ! -x /usr/bin/sg_turs; then return 0; fi
  sgdevice
  if test -z "$SGDEV"; then return 0; fi
  sg_turs /dev/$SGDEV &>/dev/null
  RC=$?
  # Handle in progress of becoming ready and unit attention -- wait at max 11s
  declare -i ctr=0
  if test $RC = 2 -o $RC = 6; then 
    RMB=`sg_inq /dev/$SGDEV | grep 'RMB=' | sed 's/^.*RMB=\(.\).*$/\1/'`
    print_and_scroll_back "$host:$channel:$id:$lun $SGDEV ($RMB) "
  fi
  while test $RC = 2 -o $RC = 6 && test $ctr -le 8; do
    if test $RC = 2 -a "$RMB" != "1"; then echo -n "."; let LN+=1; sleep 1
    else usleep 20000; fi
    let ctr+=1
    sg_turs /dev/$SGDEV &>/dev/null
    RC=$?
  done
  if test $ctr != 0; then white_out; fi
  # echo -e "\e[A\e[A\e[A${yellow}Test existence of $SGDEV = $RC ${norm} \n\n\n"
  if test $RC = 1; then return $RC; fi
  # Reset RC (might be !=0 for passive paths)
  RC=0
  # OK, device online, compare INQUIRY string
  INQ=`sg_inq $sg_len_arg /dev/$SGDEV 2>/dev/null`
  IVEND=`echo "$INQ" | grep 'Vendor identification:' | sed 's/^[^:]*: \(.*\)$/\1/'`
  IPROD=`echo "$INQ" | grep 'Product identification:' | sed 's/^[^:]*: \(.*\)$/\1/'`
  IPREV=`echo "$INQ" | grep 'Product revision level:' | sed 's/^[^:]*: \(.*\)$/\1/'`
  STR=`printf "  Vendor: %-08s Model: %-16s Rev: %-4s" "$IVEND" "$IPROD" "$IPREV"`
  IPTYPE=`echo "$INQ" | sed -n 's/.* Device_type=\([0-9]*\) .*/\1/p'`
  IPQUAL=`echo "$INQ" | sed -n 's/ *PQual=\([0-9]*\)  Device.*/\1/p'`
  if [ "$IPQUAL" != 0 ] ; then
    echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}LU not available (PQual $IPQUAL)${norm}    \n\n\n"
    return 2
  fi

  TYPE=$(printtype $IPTYPE)
  if ! procscsiscsi ; then
    echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV removed.\n\n\n"
    return 2
  fi
  TMPSTR=`echo "$SCSISTR" | grep 'Vendor:'`
  if test $ignore_rev -eq 0 ; then
      if [ "$TMPSTR" != "$STR" ]; then
        echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${SCSISTR#* } \nto: $STR ${norm} \n\n\n"
        return 1
      fi
  else
      # Ignore disk revision change
      local old_str_no_rev=`echo "$TMPSTR" | sed -e 's/.\{4\}$//'`
      local new_str_no_rev=`echo "$STR" | sed -e 's/.\{4\}$//'`
      if [ "$old_str_no_rev" != "$new_str_no_rev" ]; then
        echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${SCSISTR#* } \nto: $STR ${norm} \n\n\n"
        return 1
      fi
  fi
  TMPSTR=`echo "$SCSISTR" | sed -n 's/.*Type: *\(.*\) *ANSI.*/\1/p'`
  NTMPSTR="$(sed -e 's/[[:space:]]*$//' -e 's/^[[:space:]]*//' <<<${TMPSTR})"
  NTYPE="$(sed -e 's/[[:space:]]*$//' -e 's/^[[:space:]]*//' <<<${TYPE})"
  if [ "$NTMPSTR" != "$NTYPE" ] ; then
    echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${TMPSTR} \nto: $TYPE ${norm} \n\n\n"
    return 1
  fi
  return $RC
}

# Test if SCSI device $host $channen $id $lun exists
# Outputs description from /proc/scsi/scsi (unless arg passed)
# Returns SCSISTR (empty if no dev)
testexist ()
{
  : testexist
  SCSISTR=
  if procscsiscsi && test -z "$1"; then
    echo "$SCSISTR" | head -n1
    echo "$SCSISTR" | tail -n2 | pr -o4 -l1
  fi
}

# Returns the list of existing channels per host
chanlist ()
{
  local hcil
  local cil
  local chan
  local tmpchan

  for dev in /sys/class/scsi_device/${host}:* ; do
    [ -d $dev ] || continue;
    hcil=${dev##*/}
    cil=${hcil#*:}
    chan=${cil%%:*}
    for tmpchan in $channelsearch ; do
      if test "$chan" -eq $tmpchan ; then
	chan=
      fi
    done
    if test -n "$chan" ; then
      channelsearch="$channelsearch $chan"
    fi
  done
  if test -z "$channelsearch"; then channelsearch="0"; fi
}

# Returns the list of existing targets per host
idlist ()
{
  local hcil
  local target
  local tmpid
  local newid

  idsearch=$(ls /sys/class/scsi_device/ | sed -n "s/${host}:${channel}:\([0-9]*\):[0-9]*/\1/p" | uniq)
  echo "${channel} - -" > /sys/class/scsi_host/host${host}/scan
  # Rescan to check if we found new targets
  newsearch=$(ls /sys/class/scsi_device/ | sed -n "s/${host}:${channel}:\([0-9]*\):[0-9]*/\1/p" | uniq)
  for id in $newsearch ; do
    newid=$id
    for tmpid in $idsearch ; do
      if test $id -eq $tmpid ; then
	newid=
	break
      fi
    done
    if test -n "$newid" ; then
      id=$newid
      for dev in /sys/class/scsi_device/${host}:${channel}:${newid}:* ; do
        [ -d $dev ] || continue;
        hcil=${dev##*/}
        lun=${hcil##*:}
        printf "\r${green}NEW: $norm"
        testexist
        if test "$SCSISTR" ; then
          incrfound "$hcil"
        fi
      done
    fi
  done
}

# Returns the list of existing LUNs from device $host $channel $id $lun
# and returns list to stdout
getluns()
{
  sgdevice
  if test -z "$SGDEV"; then return 1; fi
  if test ! -x /usr/bin/sg_luns; then echo 0; return 1; fi
  LLUN=`sg_luns /dev/$SGDEV 2>/dev/null | sed -n 's/    \(.*\)/\1/p'`
  # Added -z $LLUN condition because $? gets the RC from sed, not sg_luns
  if test $? != 0 -o -z "$LLUN"; then echo 0; return 1; fi
  for lun in $LLUN ; do
      # Swap LUN number
      l0=$(printf '%u' 0x$lun)
      l1=$(( ($l0 >> 48) & 0xffff ))
      l2=$(( ($l0 >> 32) & 0xffff )) 
      l3=$(( ($l0 >> 16) & 0xffff ))
      l4=$(( $l0 & 0xffff ))
      l0=$(( ( ( ($l4 * 0xffff) + $l3 ) * 0xffff + $l2 ) * 0xffff + $l1 ))
      printf "%u\n" $l0
  done
  return 0
}

# Wait for udev to settle (create device nodes etc.)
udevadm_settle()
{
  if test -x /sbin/udevadm; then 
    print_and_scroll_back " Calling udevadm settle (can take a while) "
    /sbin/udevadm settle
    white_out
  elif test -x /sbin/udevsettle; then
    print_and_scroll_back " Calling udevsettle (can take a while) "
    /sbin/udevsettle
    white_out
  else
    usleep 20000
  fi
}

# Perform scan on a single lun $host $channel $id $lun
dolunscan()
{
  local remappedlun0=
  SCSISTR=
  devnr="$host $channel $id $lun"
  echo -e " Scanning for device $devnr ... "
  printf "${yellow}OLD: $norm"
  testexist
  # Device exists: Test whether it's still online
  # (testonline returns 2 if it's gone and 1 if it has changed)
  if test "$SCSISTR" ; then
    testonline
    RC=$?
    # Well known lun transition case. Only for Direct-Access devs (type 0)
    # If block directory exists && and PQUAL != 0, we unmapped lun0 and just have a well-known lun
    # If block directory doesn't exist && PQUAL == 0, we mapped a real lun0
    if test $lun -eq 0 -a $IPTYPE -eq 0 ; then
      if test $RC = 2 ; then
        if test -e /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device; then
          if test -d /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/block ; then
            remappedlun0=2  # Transition from real lun 0 to well-known
          else
            RC=0   # Set this so the system leaves the existing well known lun alone. This is a lun 0 with no block directory
          fi
        fi
      elif test $RC = 0 -a $IPTYPE -eq 0; then
        if test -e /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device; then
          if test ! -d /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/block ; then
            remappedlun0=1  # Transition from well-known to real lun 0
          fi
        fi
      fi
    fi
  fi

  # Special case: lun 0 just got added (for reportlunscan),
  # so make sure we correctly treat it as new
  if test "$lun" = "0" -a "$1" = "1" -a -z "$remappedlun0"; then
    SCSISTR=""
    printf "\r\e[A\e[A\e[A"
  fi

  : f $remove s $SCSISTR
  if test "$remove" -a "$SCSISTR" -o "$remappedlun0" = "1"; then
    if test $RC != 0 -o ! -z "$forceremove" -o -n "$remappedlun0"; then
      if test "$remappedlun0" != "1" ; then
        echo -en "\r\e[A\e[A\e[A${red}REM: "
        echo "$SCSISTR" | head -n1
        echo -e "${norm}\e[B\e[B"
      fi
      if test -e /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device; then
        # have to preemptively do this so we can figure out the mpath device
        # Don't do this if we're deleting a well known lun to replace it
        if test "$remappedlun0" != "1" ; then
          incrrmvd "$host:$channel:$id:$lun"
        fi
        echo 1 > /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/delete
	usleep 20000
      else
        echo "scsi remove-single-device $devnr" > /proc/scsi/scsi
	if test $RC -eq 1 -o $lun -eq 0 ; then
          # Try readding, should fail if device is gone
          echo "scsi add-single-device $devnr" > /proc/scsi/scsi
	fi
      fi
    fi
    if test $RC = 0 -o "$forcerescan" ; then
      if test -e /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device; then
        echo 1 > /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/rescan
      fi
    fi
    printf "\r\e[A\e[A\e[A${yellow}OLD: $norm"
    testexist
    if test -z "$SCSISTR" -a $RC != 1 -a "$remappedlun0" != "1"; then
      printf "\r${red}DEL: $norm\r\n\n"
      # In the event we're replacing with a well known node, we need to let it continue, to create the replacement node
      test "$remappedlun0" != "2" && return 1
    fi
  fi
  if test -z "$SCSISTR" -o -n "$remappedlun0"; then
    if test "$remappedlun0" != "2" ; then
      # Device does not exist, try to add
      printf "\r${green}NEW: $norm"
    fi
    if test -e /sys/class/scsi_host/host${host}/scan; then
      echo "$channel $id $lun" > /sys/class/scsi_host/host${host}/scan 2> /dev/null
    else
      echo "scsi add-single-device $devnr" > /proc/scsi/scsi
    fi
    testexist
    if test -z "$SCSISTR"; then
      # Device not present
      printf "\r\e[A";
      # Optimization: if lun==0, stop here (only if in non-remove mode)
      if test $lun = 0 -a -z "$remove" -a $optscan = 1; then 
        break;
      fi
    else 
      if test "$remappedlun0" != "2" ; then
        incrfound "$host:$channel:$id:$lun"
      fi
    fi
  fi
}

# Perform report lun scan on $host $channel $id using REPORT_LUNS
doreportlun()
{
  lun=0
  SCSISTR=
  devnr="$host $channel $id $lun"
  echo -en " Scanning for device $devnr ...\r"
  lun0added=
  #printf "${yellow}OLD: $norm"
  # Phase one: If LUN0 does not exist, try to add
  testexist -q
  if test -z "$SCSISTR"; then
    # Device does not exist, try to add
    #printf "\r${green}NEW: $norm"
    if test -e /sys/class/scsi_host/host${host}/scan; then
      echo "$channel $id $lun" > /sys/class/scsi_host/host${host}/scan 2> /dev/null
      udevadm_settle
    else
      echo "scsi add-single-device $devnr" > /proc/scsi/scsi
    fi
    testexist -q
    if test -n "$SCSISTR"; then
      lun0added=1
      #testonline
    else
      # Device not present
      # return
      # Find alternative LUN to send getluns to
      for dev in /sys/class/scsi_device/${host}:${channel}:${id}:*; do
        [ -d "$dev" ] || continue
	lun=${dev##*:}
        break
      done
    fi
  fi
  targetluns=`getluns`
  REPLUNSTAT=$?
  lunremove=
  #echo "getluns reports " $targetluns
  olddev=`find /sys/class/scsi_device/ -name $host:$channel:$id:* 2>/dev/null`
  oldluns=`echo "$olddev" | awk -F'/' '{print $5}' | awk -F':' '{print $4}'`
  oldtargets="$targetluns"
  # OK -- if we don't have a LUN to send a REPORT_LUNS to, we could
  # fall back to wildcard scanning. Same thing if the device does not
  # support REPORT_LUNS
  # TODO: We might be better off to ALWAYS use wildcard scanning if 
  # it works
  if test "$REPLUNSTAT" = "1"; then
    if test -e /sys/class/scsi_host/host${host}/scan; then
      echo "$channel $id -" > /sys/class/scsi_host/host${host}/scan 2> /dev/null
      udevadm_settle
    else
      echo "scsi add-single-device $host $channel $id $SCAN_WILD_CARD" > /proc/scsi/scsi
    fi
    targetluns=`find /sys/class/scsi_device/ -name $host:$channel:$id:* 2>/dev/null | awk -F'/' '{print $5}' | awk -F':' '{print $4}' | sort -n`
    let found+=`echo "$targetluns" | wc -l`
    let found-=`echo "$olddev" | wc -l`
  fi
  if test -z "$targetluns"; then targetluns="$oldtargets"; fi
  # Check existing luns
  for dev in $olddev; do
    [ -d "$dev" ] || continue
    lun=${dev##*:}
    newsearch=
    inlist=
    # OK, is existing $lun (still) in reported list
    for tmplun in $targetluns; do
      if test $tmplun -eq $lun ; then
	inlist=1
	dolunscan $lun0added
      else
	newsearch="$newsearch $tmplun"
      fi
    done
    # OK, we have now done a lunscan on $lun and 
    # $newsearch is the old $targetluns without $lun
    if [ -z "$inlist" ]; then
      # Stale lun
      lunremove="$lunremove $lun"
    fi
    # $lun removed from $lunsearch (echo for whitespace cleanup)
    targetluns=`echo $newsearch`
  done
  # Add new ones and check stale ones
  for lun in $targetluns $lunremove; do
    dolunscan $lun0added
  done
}

# Perform search (scan $host)
dosearch ()
{
  if test -z "$channelsearch" ; then
    chanlist
  fi
  for channel in $channelsearch; do
    if test -z "$idsearch" ; then
      idlist
    fi
    for id in $idsearch; do
      if test -z "$lunsearch" ; then
	doreportlun
      else
	for lun in $lunsearch; do
          dolunscan
        done
      fi
    done
  done
}
 
expandlist ()
{
  list=$1
  result=""
  first=${list%%,*}
  rest=${list#*,}
  while test ! -z "$first"; do 
    beg=${first%%-*};
    if test "$beg" = "$first"; then
      result="$result $beg";
    else
      end=${first#*-}
      result="$result `seq $beg $end`"
    fi
    test "$rest" = "$first" && rest=""
    first=${rest%%,*}
    rest=${rest#*,}
  done
  echo $result
}

searchexisting()
{
  local tmpch;
  local tmpid
  local match=0
  local targets=`ls -d /sys/class/scsi_device/$host:* 2> /dev/null | egrep -o $host:[0-9]+:[0-9]+ | sort | uniq`

  # Nothing came back on this host, so we should skip it
  test -z "$targets" && return

  local target=;
  for target in $targets ; do
    channel=`echo $target | cut -d":" -f2`
    id=`echo $target | cut -d":" -f 3`
    if [ -n "$channelsearch" ] ; then
      for tmpch in $channelsearch ; do
        test $tmpch -eq $channel && match=1	
      done
    else
      match=1
    fi
		
    test $match -eq 0 && continue
    match=0

    if [ $filter_ids -eq 1 ] ; then
      for tmpid in $idsearch ; do
        if [ $tmpid -eq $id ] ; then
          match=1
        fi
      done
    else
      match=1
    fi

    test $match -eq 0 && continue

    if [ -z "$lunsearch" ] ; then
      doreportlun
    else
      for lun in $lunsearch ; do
        dolunscan
      done
    fi
  done
}

# Go through all of the existing devices and figure out any that have been remapped
findremapped()
{
  local hctl=;
  local devs=`ls /sys/class/scsi_device/`
  local sddev=
  local id_serial=
  local id_serial_old=
  local sysfs_devpath=
  mpaths=""
  local tmpfile="/tmp/rescan-scsi-bus-`date +s`"

  test -f $tmpfile && rm $tmpfile

  # Get all of the ID_SERIAL attributes, after finding their sd node
  for hctl in $devs ; do
    if [ -d /sys/class/scsi_device/$hctl/device/block ] ; then
      sddev=`ls /sys/class/scsi_device/$hctl/device/block`	
      id_serial_old=`udevadm info -q all -n $sddev | grep "ID_SERIAL=" | cut -d"=" -f2`
      [ -z "$id_serial_old" ] && id_serial_old="none"
      echo "$hctl $sddev $id_serial_old" >> $tmpfile
    fi
  done

  # Trigger udev to update the info
  echo -n "Triggering udev to update device information... "
  /sbin/udevadm trigger
  udevadm_settle &>/dev/null
  echo "Done"

  # See what changed and reload the respective multipath device if applicable
  while read hctl sddev id_serial_old ; do
    id_serial=`udevadm info -q all -n $sddev | grep "ID_SERIAL=" | cut -d"=" -f2`
    [ -z "$id_serial" ] && id_serial="none"
    if [ "$id_serial_old" != "$id_serial" ] ; then
      if [ "$id_serial" = "1" ] ; then
        continue # the lun was unmapped and is getting the blank scsi id (1)
      fi
      printf "${yellow}REMAPPED: $norm"
      host=`echo $hctl | cut -d":" -f1`
      channel=`echo $hctl | cut -d":" -f2`
      id=`echo $hctl | cut -d":" -f3`
      lun=`echo $hctl | cut -d":" -f4`
      procscsiscsi
      echo "$SCSISTR"
      incrchgd "$hctl"
    fi
  done < $tmpfile
  rm $tmpfile &>/dev/null

  if test -n "$mp_enable" -a -n "$mpaths" ; then
    echo "Updating multipath device mappings"
    flushmpaths
    $MULTIPATH | grep "create:" 2> /dev/null
  fi
}

incrfound()
{
  local hctl="$1"
  if test -n "$hctl" ; then
    let found+=1
    FOUNDDEVS="$FOUNDDEVS\t[$hctl]\n"
  else
    return
  fi
}

incrchgd()
{
  local hctl="$1"
  if test -n "$hctl" ; then
    let updated+=1
    CHGDEVS="$CHGDEVS\t[$hctl]\n"
  else
    return
  fi

  if test -n "$mp_enable" ; then
    local sdev="`findsddev \"$hctl\"`"
    if test -n "$sdev" ; then
      findmultipath "$sdev"
    fi
  fi
}

incrrmvd()
{
  local hctl="$1"
  if test -n "$hctl" ; then
    let rmvd+=1;
    RMVDDEVS="$RMVDDEVS\t[$hctl]\n"
  else
    return
  fi

  if test -n "$mp_enable" ; then
    local sdev="`findsddev \"$hctl\"`"
    if test -n "$sdev" ; then
      findmultipath "$sdev"
    fi
  fi
}

findsddev()
{
  local hctl="$1"
  local sddev=  

  if test ! -e /sys/class/scsi_device/$hctl/device/block ; then
    return 1
  fi 

  sddev=`ls /sys/class/scsi_device/$hctl/device/block`
  echo $sddev

  return 0
}

findmultipath()
{
  local dev="$1"
  local mp=
  local mp2=

  # Need a sdev, and executable multipath and dmsetup command here
  if [ -z "$dev" ] || [ ! -x $DMSETUP ] ; then
    return 1
  fi

  local maj_min=`cat /sys/block/$dev/dev`
  for mp in $($DMSETUP ls --target=multipath | cut -f 1) ; do
    if $($DMSETUP status $mp | grep -q " $maj_min ") ; then
      for mp2 in $mpaths ; do
        # mp device is already there, return
        if [ "$mp2" = "$mp" ] ; then
          return
        fi
      done
      mpaths="$mpaths $mp"
      return
    fi
  done
}

reloadmpaths()
{
  local mpath
  if [ ! -x $MULTIPATH ] ; then
    echo "no -x multipath"
    return
  fi

  if [ "$1" = "1" ] ; then
    echo "Reloading all multipath devices"
    $MULTIPATH -r &>/dev/null
    return
  fi

  # Reload the multipath devices
  for mpath in $mpaths ; do
    echo "Reloading multipath device $mpath"
    $MULTIPATH -r $mpath &>/dev/null
  done
}

flushmpaths()
{
  local mpath
  # Mode: flush only failed
  if test -n "$1" ; then
    for mpath in $($DMSETUP ls --target=multipath | cut -f 1) ; do
      num=$($DMSETUP status $mpath | awk 'BEGIN{RS=" ";active=0}/[0-9]+:[0-9]+/{dev=1}/A/{if (dev == 1) active++; dev=0} END{ print active }')
      if [ $num -eq 0 ] ; then
        echo -n "Flushing multipath device $mpath...  "
        $DMSETUP message $mpath 0 fail_if_no_path &>/dev/null
        $MULTIPATH -f $mpath &>/dev/null
        $DMSETUP status $mpath &>/dev/null
        if test "$?" = "1" ; then
          echo "Done"
        else
          echo "Fail"
        fi
      fi
    done
    return
  fi
  # Flush all the devs specified in $mpaths
  for mpath in $mpaths ; do
    echo -n "Flushing multipath device $mpath...  "
    $DMSETUP message $mpath 0 fail_if_no_path &>/dev/null
    $MULTIPATH -f $mpath &>/dev/null
    $DMSETUP status $mpath &>/dev/null
    if test "$?" = "1" ; then
      echo "Done"
    else
      echo "Fail"
    fi
  done
}


# Find resized luns
findresized()
{
  local devs=`ls /sys/class/scsi_device/`
  local size=
  local new_size=
  local sysfs_path=
  local sddev=

  for hctl in $devs ; do
    sysfs_path="/sys/class/scsi_device/$hctl/device"
    if [ -d "$sysfs_path/block" ] ; then
      sddev=`ls $sysfs_path/block`
      size=`cat $sysfs_path/block/$sddev/size`
	
      echo 1 > $sysfs_path/rescan
      new_size=`cat $sysfs_path/block/$sddev/size`	
		
      if [ "$size" != "$new_size" ] && [ "$size" != "0" ] && [ "$new_size" != "0" ] ; then
        printf "${yellow}RESIZED: $norm"
        host=`echo $hctl | cut -d":" -f1`
        channel=`echo $hctl | cut -d":" -f2`
        id=`echo $hctl | cut -d":" -f3`
        lun=`echo $hctl | cut -d":" -f4`

        procscsiscsi
        echo "$SCSISTR"
        incrchgd "$hctl"
      fi
    fi
  done

  if test -n "$mp_enable" -a -n "$mpaths" ; then
    reloadmpaths
  fi
}

FOUNDDEVS=""
CHGDEVS=""
RMVDDEVS=""

# main
if test @$1 = @--help -o @$1 = @-h -o @$1 = @-?; then
    echo "Usage: rescan-scsi-bus.sh [options] [host [host ...]]"
    echo "Options:"
    echo " -a      scan all targets, not just currently existing [default: disabled]"
    echo " -d      enable debug                       [default: 0]"
    echo " -l      activates scanning for LUNs 0--7   [default: 0]"
    echo " -L NUM  activates scanning for LUNs 0--NUM [default: 0]"
    echo " -w      scan for target device IDs 0--15   [default: 0--7]"
    echo " -c      enables scanning of channels 0 1   [default: 0 / all detected ones]"
    echo " -m      update multipath devices           [default: disabled]"
    echo " -r      enables removing of devices        [default: disabled]"
    echo " -f      flush failed multipath devices     [default: disabled]"
    echo " -i      issue a FibreChannel LIP reset     [default: disabled]"
    echo " -u      look for existing disks that have been remapped"
    echo " -s      look for resized disks and reload associated multipath devices, if applicable"
    echo "--alltargets:    same as -a"
    echo "--remove:        same as -r"
    echo "--flush:         same as -f"
    echo "--issue-lip:     same as -i"
    echo "--wide:          same as -w"
    echo "--multipath:     same as -m"
    echo "--forceremove:   Remove stale devices (DANGEROUS)"
    echo "--forcerescan:   Remove and readd existing devices (DANGEROUS)"
    echo "--nooptscan:     don't stop looking for LUNs if 0 is not found"
    echo "--color:         use coloured prefixes OLD/NEW/DEL"
    echo "--hosts=LIST:    Scan only host(s) in LIST"
    echo "--channels=LIST: Scan only channel(s) in LIST"
    echo "--ids=LIST:      Scan only target ID(s) in LIST"
    echo "--luns=LIST:     Scan only lun(s) in LIST"  
    echo "--sync/nosync:   Issue a sync / no sync [default: sync if remove]"
    echo "--attachpq3:     Tell kernel to attach sg to LUN 0 that reports PQ=3"
    echo "--reportlun2:    Tell kernel to try REPORT_LUN even on SCSI2 devices"
    echo "--largelun:      Tell kernel to support LUNs > 7 even on SCSI2 devs"
    echo "--sparselun:     Tell kernel to support sparse LUN numbering"
    echo "--update:        same as -u"
    echo "--resize:        same as -s"
    echo "--ignore-rev:    Ignore the revision change"
    echo " Host numbers may thus be specified either directly on cmd line (deprecated) or"
    echo " or with the --hosts=LIST parameter (recommended)."
    echo "LIST: A[-B][,C[-D]]... is a comma separated list of single values and ranges"
    echo " (No spaces allowed.)"
    exit 0
fi

if test ! -d /sys/class/scsi_host/ -a ! -d /proc/scsi/; then
  echo "Error: SCSI subsystem not active"
  exit 1
fi	

# Make sure sg is there
modprobe sg &>/dev/null

if test -x /usr/bin/sg_inq; then
  sg_version=$(sg_inq -V 2>&1 | cut -d " " -f 3)
  if test -n "$sg_version"; then
    sg_ver_maj=${sg_version:0:1}
    sg_version=${sg_version##?.}
    let sg_version+=$((100*$sg_ver_maj))
  fi
  sg_version=${sg_version##0.}
  #echo "\"$sg_version\""
  if [ -z "$sg_version" -o "$sg_version" -lt 70 ] ; then
    sg_len_arg="-36"
  else
    sg_len_arg="--len=36"
  fi
else
  echo "WARN: /usr/bin/sg_inq not present -- please install sg3_utils"
  echo " or rescan-scsi-bus.sh might not fully work."     
fi    

# defaults
unsetcolor
debug=0
lunsearch=
opt_idsearch=`seq 0 7`
filter_ids=0
opt_channelsearch=
remove=
updated=0
update=0
resize=0
forceremove=
optscan=1
sync=1
existing_targets=1
mp_enable=
declare -i scan_flags=0
ignore_rev=0

# Scan options
opt="$1"
while test ! -z "$opt" -a -z "${opt##-*}"; do
  opt=${opt#-}
  case "$opt" in
    a) existing_targets=;;  #Scan ALL targets when specified
    d) debug=1 ;;
    f) flush=1 ;;
    l) lunsearch=`seq 0 7` ;;
    L) lunsearch=`seq 0 $2`; shift ;;
    m) mp_enable=1 ;;
    w) opt_idsearch=`seq 0 15` ;;
    c) opt_channelsearch="0 1" ;;
    r) remove=1 ;;
    s) resize=1 ;;
    i) lipreset=1 ;;
    u) update=1 ;;
    -alltargets)  existing_targets=;;
    -flush)       flush=1 ;;
    -remove)      remove=1 ;;
    -forcerescan) remove=1; forcerescan=1 ;;
    -forceremove) remove=1; forceremove=1 ;;
    -hosts=*)     arg=${opt#-hosts=};   hosts=`expandlist $arg` ;;
    -channels=*)  arg=${opt#-channels=};opt_channelsearch=`expandlist $arg` ;; 
    -ids=*)   arg=${opt#-ids=};         opt_idsearch=`expandlist $arg` ; filter_ids=1;;
    -luns=*)  arg=${opt#-luns=};        lunsearch=`expandlist $arg` ;; 
    -color) setcolor ;;
    -nooptscan) optscan=0 ;;
    -issue-lip) lipreset=1 ;;
    -sync) sync=2 ;;
    -nosync) sync=0 ;;
    -multipath) mp_enable=1 ;;
    -attachpq3) scan_flags=$(($scan_flags|0x1000000)) ;;
    -reportlun2) scan_flags=$(($scan_flags|0x20000)) ;;
    -resize) resize=1;;
    -largelun) scan_flags=$(($scan_flags|0x200)) ;;
    -sparselun) scan_flags=$((scan_flags|0x40)) ;;
    -update) update=1;;
    -wide) opt_idsearch=`seq 0 15` ;;
    -ignore-rev) ignore_rev=1;;
    *) echo "Unknown option -$opt !" ;;
  esac
  shift
  opt="$1"
done    

if [ -z "$hosts" ] ; then
  if test -d /sys/class/scsi_host; then 
    findhosts_26
  else  
    findhosts
  fi  
fi

if [ -d /sys/class/scsi_host -a ! -w /sys/class/scsi_host ]; then
  echo "You need to run scsi-rescan-bus.sh as root"
  exit 2
fi  
if test "$sync" = 1 -a "$remove" = 1; then sync=2; fi
if test "$sync" = 2; then echo "Syncing file systems"; sync; fi
if test -w /sys/module/scsi_mod/parameters/default_dev_flags -a $scan_flags != 0; then
  OLD_SCANFLAGS=`cat /sys/module/scsi_mod/parameters/default_dev_flags`
  NEW_SCANFLAGS=$(($OLD_SCANFLAGS|$scan_flags))
  if test "$OLD_SCANFLAGS" != "$NEW_SCANFLAGS"; then
    echo -n "Temporarily setting kernel scanning flags from "
    printf "0x%08x to 0x%08x\n" $OLD_SCANFLAGS $NEW_SCANFLAGS
    echo $NEW_SCANFLAGS > /sys/module/scsi_mod/parameters/default_dev_flags
  else
    unset OLD_SCANFLAGS
  fi
fi  
DMSETUP=$(which dmsetup)
[ -z "$DMSETUP" ] && flush= && mp_enable=
MULTIPATH=$(which multipath)
[ -z "$MULTIPATH" ] && flush= && mp_enable=

echo -n "Scanning SCSI subsystem for new devices"
test -z "$flush" || echo -n ", flush failed multipath devices,"
test -z "$remove" || echo -n " and remove devices that have disappeared"
echo
declare -i found=0
declare -i updated=0
declare -i rmvd=0

if [ -n "$flush" ] ; then
  if [ -x $MULTIPATH ] ; then
    flushmpaths 1
  fi
fi

# Update existing mappings
if [ $update -eq 1 ] ; then
  echo "Searching for remapped LUNs"
  findremapped
# Search for resized LUNs
elif [ $resize -eq 1 ] ; then
  echo "Searching for resized LUNs"
  findresized
# Normal rescan mode
else
  for host in $hosts; do
  echo -n "Scanning host $host "
  if test -e /sys/class/fc_host/host$host ; then
    # It's pointless to do a target scan on FC
    if test -n "$lipreset" ; then
      echo 1 > /sys/class/fc_host/host$host/issue_lip 2> /dev/null;
      udevadm_settle
    fi
    channelsearch=
    idsearch=
  else
    channelsearch=$opt_channelsearch
    idsearch=$opt_idsearch
  fi
  [ -n "$channelsearch" ] && echo -n "channels $channelsearch "
  echo -n "for "
  if [ -n "$idsearch" ] ; then
    echo -n " SCSI target IDs " $idsearch
  else
    echo -n " all SCSI target IDs"
  fi
  if [ -n "$lunsearch" ] ; then
    echo ", LUNs " $lunsearch
  else
    echo ", all LUNs"
  fi

  if [ -n "$existing_targets" ] ; then
    searchexisting
  else
    dosearch
  fi
  done
  if test -n "$OLD_SCANFLAGS"; then
    echo $OLD_SCANFLAGS > /sys/module/scsi_mod/parameters/default_dev_flags
  fi
fi

let rmvd_found=$rmvd+$found
if test -n "$mp_enable" -a $rmvd_found -gt 0 ; then
  echo "Attempting to update multipath devices..."
  if test $rmvd -gt 0 ; then
    /sbin/udevadm trigger
    udevadm_settle
    echo "Removing multipath mappings for removed devices if all paths are now failed... "
    flushmpaths 1
  fi
  if test $found -gt 0 ; then
    /sbin/udevadm trigger
    udevadm_settle
    echo "Trying to discover new multipath mappings for newly discovered devices... "
    $MULTIPATH | grep "create:" 2> /dev/null
  fi 
fi

echo "$found new or changed device(s) found.          "
if test ! -z "$FOUNDDEVS" ; then
  printf "$FOUNDDEVS"
fi
echo "$updated remapped or resized device(s) found.		"
if test ! -z "$CHGDEVS" ; then
  printf "$CHGDEVS"
fi
echo "$rmvd device(s) removed.                 "
if test ! -z "$RMVDDEVS" ; then
  printf "$RMVDDEVS"
fi

# Local Variables:
# sh-basic-offset: 2
# End: