#!/bin/bash
# Script 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--2018 Hannes Reinecke, GNU GPL v2 or later
# $Id: rescan-scsi-bus.sh,v 1.57 2012/03/31 14:08:48 garloff Exp $
VERSION="20180615"
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 [ $cntr -lt "$LN" ] ; do BK="$BK\e[D"; let cntr+=1; done
echo -en "$STRG$BK"
return "$LN"
}
# Overwrite a text of length $LN with whitespace
white_out ()
{
BK=""; WH=""
declare -i cntr=0
while [ $cntr -lt "$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=
for hostdir in /sys/class/scsi_host/host* ; do
[ -e "$hostdir" ] || continue
hostno=${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 [ "$driver" = scsi ] || [ "$driver" = sg ] || [ "$driver" = dummy ] || [ "$driver" = device_info ] ; then continue; fi
for hostdir in $driverdir/*; do
name=${hostdir#/proc/scsi/*/}
if [ "$name" = add_map ] || [ "$name" = map ] || [ "$name" = mod_parm ] ; then continue; fi
num=$name
driverinfo=$driver
if [ -r "$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 [ -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=$(printf ' Type: %-17s ANSI SCSI revision: %02d' "$ITYPE" "$((ILVL - 1))")
SCSISTR="$SCSISTR
$SCSITMP"
fi
else
return 1
fi
else
grepstr="scsi$host Channel: $CHANNEL Id: $ID Lun: $LUN"
SCSISTR=$(grep -A "$LN" -e "$grepstr" /proc/scsi/scsi)
fi
if [ -z "$SCSISTR" ] ; then
return 1
else
return 0
fi
}
# Find sg device with 2.6 sysfs support
sgdevice26 ()
{
local gendev
gendev=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/generic
if [ -e "$gendev" ] ; then
SGDEV=$(basename "$(readlink "$gendev")")
else
for SGDEV in /sys/class/scsi_generic/sg*; do
DEV=$(readlink "$SGDEV/device")
if [ "${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 $lun
# and return in SGDEV
sgdevice ()
{
SGDEV=
if [ -d /sys/class/scsi_device ] ; then
sgdevice26
else
DRV=$(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)
[ $? -eq 1 ] && return
fi
if ! echo "$DRV" | grep -q 'drivers: sg'; then
modprobe sg
fi
sgdevice24
if [ $repdevstat = 0 ]; then
echo "scsi report-devs 0" >/proc/scsi/scsi
fi
fi
}
# Whether or not the RMB (removable) bit has been set in the INQUIRY response.
# Uses ${host}, ${channel}, ${id} and ${lun}. Assumes that sg_device() has
# already been called. How to test this function: copy/paste this function
# in a shell and run
# (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=$4 is_removable; done)
is_removable ()
{
local b p
p=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/inquiry
# Extract the second byte of the INQUIRY response and check bit 7 (mask 0x80).
b=$(hexdump -n1 -e '/1 "%02X"' "$p" 2>/dev/null)
if [ -n "$b" ]; then
echo $(((0x$b & 0x80) != 0))
else
sg_inq /dev/$SGDEV 2>/dev/null | sed -n 's/^.*RMB=\([0-9]*\).*$/\1/p'
fi
}
# Test if SCSI device is still responding to commands
# Return values:
# 0 device is present
# 1 device has changed
# 2 device has been removed
testonline ()
{
local ctr RC RMB
: testonline
ctr=0
RC=0
# Set default values
IPTYPE=31
IPQUAL=3
[ ! -x /usr/bin/sg_turs ] && return 0
sgdevice
[ -z "$SGDEV" ] && return 0
sg_turs /dev/$SGDEV >/dev/null 2>&1
RC=$?
# Handle in progress of becoming ready and unit attention
while [ $RC = 2 -o $RC = 6 ] && [ $ctr -le 30 ] ; do
if [ $RC = 2 ] && [ "$RMB" != "1" ] ; then
echo -n "."
let LN+=1
sleep 1
else
sleep 0.02
fi
let ctr+=1
sg_turs /dev/$SGDEV >/dev/null 2>&1
RC=$?
# Check for removable device; TEST UNIT READY obviously will
# fail for a removable device with no medium
RMB=$(is_removable)
print_and_scroll_back "$host:$channel:$id:$lun $SGDEV ($RMB) "
[ $RC = 2 ] && [ "$RMB" = "1" ] && break
done
if [ $ctr != 0 ] ; then
white_out
fi
# echo -e "\e[A\e[A\e[A${yellow}Test existence of $SGDEV = $RC ${norm} \n\n\n"
[ $RC = 1 ] && return $RC
# Reset RC (might be !=0 for passive paths)
RC=0
# OK, device online, compare INQUIRY string
INQ=$(sg_inq "$sg_len_arg" /dev/$SGDEV 2>/dev/null)
if [ -z "$INQ" ] ; then
echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}INQUIRY failed${norm} \n\n\n"
return 2
fi
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')
if [ -z "$IPTYPE" ]; then
IPTYPE=$(echo "$INQ" | sed -n 's/.* PDT=\([0-9]*\) .*/\1/p')
fi
IPQUAL=$(echo "$INQ" | sed -n 's/ *PQual=\([0-9]*\) Device.*/\1/p')
if [ -z "$IPQUAL" ] ; then
IPQUAL=$(echo "$INQ" | sed -n 's/ *PQual=\([0-9]*\) PDT.*/\1/p')
fi
if [ "$IPQUAL" != 0 ] ; then
[ -z "$IPQUAL" ] && IPQUAL=3
[ -z "$IPTYPE" ] && IPTYPE=31
echo -e "\e[A\e[A\e[A\e[A${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 "$SCSISTR" | grep 'Vendor:')
if [ "$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 ${norm} \n\n\n"
return 1
fi
else
# Ignore disk revision change
local old_str_no_rev=
local new_str_no_rev=
old_str_no_rev=${TMPSTR%Rev:*}
new_str_no_rev=${STR%Rev:*}
if [ "$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' | sed 's/ *$//g')
if [ "$TMPSTR" != "$TYPE" ] ; then
echo -e "\e[A\e[A\e[A\e[A${red}$SGDEV changed: ${bold}\nfrom:${TMPSTR} \nto: $TYPE ${norm} \n\n\n"
return 1
fi
return $RC
}
# Test if SCSI device $host $channel $id $lun exists
# Outputs description from /proc/scsi/scsi (unless arg passed)
# Returns SCSISTR (empty if no dev)
testexist ()
{
: testexist
SCSISTR=
if procscsiscsi && [ -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 $channelsearch ; do
if [ "$chan" -eq "$tmpchan" ] ; then
chan=
fi
done
if [ -n "$chan" ] ; then
channelsearch="$channelsearch $chan"
fi
done
if [ -z "$channelsearch" ] ; then
channelsearch="0"
fi
}
# Returns the list of existing targets per host
idlist ()
{
local tmpid
local newid
local oldid
oldlist=$(find /sys/class/scsi_device -name "${host}:${channel}:*" -printf "%f\n")
# Rescan LUN 0 to check if we found new targets
echo "${channel} - -" > "/sys/class/scsi_host/host${host}/scan"
newlist=$(find /sys/class/scsi_device -name "${host}:${channel}:*" -printf "%f\n")
for newid in $newlist ; do
oldid=$newid
for tmpid in $oldlist ; do
if [ "$newid" = "$tmpid" ] ; then
oldid=
break
fi
done
if [ -n "$oldid" ] ; then
if [ -d /sys/class/scsi_device/$oldid ] ; then
hcil=${oldid}
printf "\r${green}NEW: %s" "$norm"
testexist
if [ "$SCSISTR" ] ; then
incrfound "$hcil"
fi
fi
fi
done
idsearch=$(find /sys/bus/scsi/devices -name "target${host}:${channel}:*" -printf "%f\n" | cut -f 3 -d :)
}
# Returns the list of existing LUNs from device $host $channel $id $lun
# and returns list to stdout
getluns()
{
sgdevice
[ -z "$SGDEV" ] && return 1
if [ ! -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 [ $? -ne 0 ] || [ -z "$LLUN" ] ; then
echo 0
return 1
fi
for lun in $LLUN ; do
# Swap LUN number
l0=0x$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()
{
local tmo=60
if [ -x /bin/udevadm ] ; then
print_and_scroll_back " Calling udevadm settle (can take a while) "
# Loop for up to 60 seconds if sd devices still are settling..
# This allows us to continue if udev events are stuck on multipaths in recovery mode
while [ $tmo -gt 0 ] ; do
if ! /bin/udevadm settle --timeout=1 | egrep -q sd[a-z]+ ; then
break;
fi
let tmo=$tmo-1
done
white_out
elif [ -x /sbin/udevsettle ] ; then
print_and_scroll_back " Calling udevsettle (can take a while) "
/sbin/udevsettle
white_out
else
sleep 0.02
fi
}
# Perform scan on a single lun $host $channel $id $lun
dolunscan()
{
local remappedlun0=
local devpath
SCSISTR=
devnr="$host $channel $id $lun"
echo -e " Scanning for device $devnr ... "
printf "${yellow}OLD: %s" "$norm"
testexist
# Device exists: Test whether it's still online
# (testonline returns 2 if it's gone and 1 if it has changed)
devpath="/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device"
if [ "$SCSISTR" ] ; then
testonline
RC=$?
# Well known lun transition case. Only for Direct-Access devs (type 0)
# If block directory exists && and PQUAL != 0, we unmapped lun0 and just have a well-known lun
# If block directory doesn't exist && PQUAL == 0, we mapped a real lun0
if [ "$lun" -eq 0 ] && [ $IPTYPE -eq 0 ] ; then
if [ $RC = 2 ] ; then
if [ -e "$devpath" ] ; then
if [ -d "$devpath/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 [ $RC = 0 ] && [ $IPTYPE -eq 0 ] ; then
if [ -e "$devpath" ] ; then
if [ ! -d "$devpath/block" ] ; then
remappedlun0=1 # Transition from well-known to real lun 0
fi
fi
fi
fi
fi
# Special case: lun 0 just got added (for reportlunscan),
# so make sure we correctly treat it as new
if [ "$lun" = "0" ] && [ "$1" = "1" ] && [ -z "$remappedlun0" ] ; then
SCSISTR=""
printf "\r\e[A\e[A\e[A"
fi
: f "$remove" s $SCSISTR
if [ "$remove" ] && [ "$SCSISTR" -o "$remappedlun0" = "1" ] ; then
if [ $RC != 0 ] || [ ! -z "$forceremove" ] || [ -n "$remappedlun0" ] ; then
if [ "$remappedlun0" != "1" ] ; then
echo -en "\r\e[A\e[A\e[A${red}REM: "
echo "$SCSISTR" | head -n1
echo -e "${norm}\e[B\e[B"
fi
if [ -e "$devpath" ] ; 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 [ "$remappedlun0" != "1" ] ; then
incrrmvd "$host:$channel:$id:$lun"
fi
echo 1 > "$devpath/delete"
sleep 0.02
else
echo "scsi remove-single-device $devnr" > /proc/scsi/scsi
if [ $RC -eq 1 ] || [ "$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 [ $RC = 0 ] || [ "$forcerescan" ] ; then
if [ -e "$devpath" ] ; then
echo 1 > "$devpath/rescan"
fi
fi
printf "\r\e[A\e[A\e[A${yellow}OLD: %s" "$norm"
testexist
if [ -z "$SCSISTR" ] && [ $RC != 1 ] && [ "$remappedlun0" != "1" ] ; then
printf "\r${red}DEL: %s\r\n\n" "$norm"
# In the event we're replacing with a well known node, we need to let it continue, to create the replacement node
[ "$remappedlun0" != "2" ] && return 2
fi
fi
if [ -z "$SCSISTR" ] || [ -n "$remappedlun0" ] ; then
if [ "$remappedlun0" != "2" ] ; then
# Device does not exist, try to add
printf "\r${green}NEW: %s" "$norm"
fi
if [ -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 $devnr" > /proc/scsi/scsi
fi
testexist
if [ -z "$SCSISTR" ] ; then
# Device not present
printf "\r\e[A";
# Optimization: if lun==0, stop here (only if in non-remove mode)
if [ "$lun" = 0 ] && [ -z "$remove" ] && [ "$optscan" = 1 ] ; then
return 1;
fi
else
if [ "$remappedlun0" != "2" ] ; then
incrfound "$host:$channel:$id:$lun"
fi
fi
fi
return 0;
}
# 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: %s" "$norm"
# Phase one: If LUN0 does not exist, try to add
testexist -q
if [ -z "$SCSISTR" ] ; then
# Device does not exist, try to add
#printf "\r${green}NEW: %s" "$norm"
if [ -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 $devnr" > /proc/scsi/scsi
fi
testexist -q
if [ -n "$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:$id:*" 2>/dev/null | sort -t: -k4 -n)
oldtargets="$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 [ "$REPLUNSTAT" = "1" ] ; then
if [ -e "/sys/class/scsi_host/host${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:$id:*" -printf "%f\n" | cut -d : -f 4)
let found+=$(echo "$targetluns" | wc -l)
let found-=$(echo "$olddev" | wc -l)
fi
[ -z "$targetluns" ] && targetluns="$oldtargets"
# 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 $targetluns; do
if [ "$tmplun" = "$lun" ] ; then
inlist=1
dolunscan $lun0added
[ $? -eq 1 ] && break
else
newsearch="$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 $lunsearch
targetluns=${newsearch# }
done
# Add new ones and check stale ones
for lun in $targetluns $lunremove; do
dolunscan $lun0added
[ $? -eq 1 ] && break
done
}
# Perform search (scan $host)
dosearch ()
{
if [ -z "$channelsearch" ] ; then
chanlist
fi
for channel in $channelsearch; do
if [ -z "$idsearch" ] ; then
if [ -z "$lunsearch" ] ; then
idlist
else
idsearch=$(find /sys/bus/scsi/devices -name "target${host}:${channel}:*" -printf "%f\n" | cut -f 3 -d :)
fi
fi
for id in $idsearch; do
if [ -z "$lunsearch" ] ; then
doreportlun
else
for lun in $lunsearch; do
dolunscan
[ $? -eq 1 ] && break
done
fi
done
done
}
expandlist ()
{
list=$1
result=""
first=${list%%,*}
rest=${list#*,}
while [ ! -z "$first" ] ; do
beg=${first%%-*};
if [ "$beg" = "$first" ] ; then
result="$result $beg";
else
end=${first#*-}
result="$result $(seq $beg $end)"
fi
[ "$rest" = "$first" ] && rest=""
first=${rest%%,*}
rest=${rest#*,}
done
echo "$result"
}
searchexisting()
{
local tmpch;
local tmpid
local match=0
local targets=
targets=$(find /sys/bus/scsi/devices -name "target${host}:*" -printf "%f\n" | cut -d : -f 2-3)
# Nothing came back on this host, so we should skip it
[ -z "$targets" ] && return
local target=;
for target in $targets ; do
channel=${target%:*}
id=${target#*:}
if [ -n "$channelsearch" ] ; then
for tmpch in $channelsearch ; do
[ $tmpch -eq "$channel" ] && match=1
done
else
match=1
fi
[ $match -eq 0 ] && continue
match=0
if [ "$filter_ids" -eq 1 ] ; then
for tmpid in $idsearch ; do
if [ "$tmpid" = "$id" ] ; then
match=1
fi
done
else
match=1
fi
[ $match -eq 0 ] && continue
if [ -z "$lunsearch" ] ; then
doreportlun
else
for lun in $lunsearch ; do
dolunscan
[ $? -eq 1 ] && break
done
fi
done
}
# Go through all of the existing devices and figure out any that have been remapped
findremapped()
{
local hctl=;
local devs=
local sddev=
local id_serial=
local id_serial_old=
local remapped=
mpaths=""
local tmpfile=
tmpfile=$(mktemp /tmp/rescan-scsi-bus.XXXXXXXX 2> /dev/null)
if [ -z "$tmpfile" ] ; then
tmpfile="/tmp/rescan-scsi-bus.$$"
rm -f $tmpfile
fi
# Get all of the ID_SERIAL attributes, after finding their sd node
devs=$(ls /sys/class/scsi_device/)
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" >> $tmpfile
fi
done
# Trigger udev to update the info
echo -n "Triggering udev to update device information... "
/bin/udevadm trigger
udevadm_settle 2>&1 /dev/null
echo "Done"
# See what changed and reload the respective multipath device if applicable
while read -r hctl sddev id_serial_old ; do
remapped=0
id_serial=$(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
remapped=1
fi
# If udev events updated the disks already, but the multipath device isn't update
# check for old devices to make sure we found remapped luns
if [ -n "$mp_enable" ] && [ $remapped -eq 0 ]; then
findmultipath "$sddev" $id_serial
if [ $? -eq 1 ] ; then
remapped=1
fi
fi
# if uuid is 1, it's unmapped, so we don't want to treat it as a remap
# if remapped flag is 0, just skip the rest of the logic
if [ "$id_serial" = "1" ] || [ $remapped -eq 0 ] ; then
continue
fi
printf "${yellow}REMAPPED: %s" "$norm"
host=$(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"
done < $tmpfile
rm -f $tmpfile
if [ -n "$mp_enable" ] && [ -n "$mpaths" ] ; then
echo "Updating multipath device mappings"
flushmpaths
$MULTIPATH | grep "create:" 2> /dev/null
fi
}
incrfound()
{
local hctl="$1"
if [ -n "$hctl" ] ; then
let found+=1
FOUNDDEVS="$FOUNDDEVS\t[$hctl]\n"
else
return
fi
}
incrchgd()
{
local hctl="$1"
if [ -n "$hctl" ] ; then
if ! echo "$CHGDEVS" | grep -q "\[$hctl\]"; then
let updated+=1
CHGDEVS="$CHGDEVS\t[$hctl]\n"
fi
else
return
fi
if [ -n "$mp_enable" ] ; then
local sdev
sdev=$(findsddev "$hctl")
if [ -n "$sdev" ] ; then
findmultipath "$sdev"
fi
fi
}
incrrmvd()
{
local hctl="$1"
if [ -n "$hctl" ] ; then
let rmvd+=1;
RMVDDEVS="$RMVDDEVS\t[$hctl]\n"
else
return
fi
if [ -n "$mp_enable" ] ; then
local sdev
sdev=$(findsddev "$hctl")
if [ -n "$sdev" ] ; then
findmultipath "$sdev"
fi
fi
}
findsddev()
{
local hctl="$1"
local sddev=
local blkpath
blkpath="/sys/class/scsi_device/$hctl/device/block"
if [ -e "$blkpath" ] ; then
sddev=$(ls "$blkpath")
echo "$sddev"
fi
}
addmpathtolist()
{
local mp="$1"
local mp2=
for mp2 in $mpaths ; do
# The multipath device is already in the list
if [ "$mp2" = "$mp" ] ; then
return
fi
done
mpaths="$mpaths $mp"
}
findmultipath()
{
local dev="$1"
local find_mismatch="$2"
local mp=
local mp2=
local found_dup=0
local maj_min=
# Need a sdev, and executable multipath and dmsetup command here
if [ -z "$dev" ] || [ ! -x "$DMSETUP" ] || [ ! -x "$MULTIPATH" ] ; then
return 1
fi
maj_min=$(cat "/sys/block/$dev/dev")
for mp in $($DMSETUP ls --target=multipath | cut -f 1) ; do
[ "$mp" = "No" ] && break;
if "$DMSETUP" status "$mp" | grep -q " $maj_min "; then
# With two arguments, look up current uuid from sysfs
# if it doesn't match what was passed, this multipath
# device is not updated, so this is a remapped LUN
if [ -n "$find_mismatch" ] ; then
mp2=$($MULTIPATH -l "$mp" | egrep -o "dm-[0-9]+")
mp2=$(cut -f2 -d- "/sys/block/$mp2/dm/uuid")
if [ "$find_mismatch" != "$mp2" ] ; then
addmpathtolist "$mp"
found_dup=1
fi
continue
fi
# Normal mode: Find the first multipath with the sdev
# and add it to the list
addmpathtolist "$mp"
return
fi
done
# Return 1 to signal that a duplicate was found to the calling function
if [ $found_dup -eq 1 ] ; then
return 1
else
return 0
fi
}
reloadmpaths()
{
local mpath
if [ ! -x "$MULTIPATH" ] ; then
echo "no -x multipath"
return
fi
# Pass 1 as the argument to reload all mpaths
if [ "$1" = "1" ] ; then
echo "Reloading all multipath devices"
$MULTIPATH -r > /dev/null 2>&1
return
fi
# Reload the multipath devices
for mpath in $mpaths ; do
echo -n "Reloading multipath device $mpath... "
if $MULTIPATH -r "$mpath" > /dev/null 2>&1 ; then
echo "Done"
else
echo "Fail"
fi
done
}
resizempaths()
{
local mpath
for mpath in $mpaths ; do
echo -n "Resizing multipath map $mpath ..."
multipathd -k"resize map $mpath"
let updated+=1
done
}
flushmpaths()
{
local mpath
local remove=""
local i
local flush_retries=5
if [ -n "$1" ] ; then
for mpath in $($DMSETUP ls --target=multipath | cut -f 1) ; do
[ "$mpath" = "No" ] && break
num=$($DMSETUP status "$mpath" | awk 'BEGIN{RS=" ";active=0}/[0-9]+:[0-9]+/{dev=1}/A/{if (dev == 1) active++; dev=0} END{ print active }')
if [ "$num" -eq 0 ] ; then
remove="$remove $mpath"
fi
done
else
remove="$mpaths"
fi
for mpath in $remove ; do
i=0
echo -n "Flushing multipath device $mpath... "
while [ $i -lt $flush_retries ] ; do
$DMSETUP message "$mpath" 0 fail_if_no_path > /dev/null 2>&1
if $MULTIPATH -f "$mpath" > /dev/null 2>&1 ; then
echo "Done ($i retries)"
break
elif [ $i -eq $flush_retries ] ; then
echo "Fail"
fi
sleep 0.02
let i=$i+1
done
done
}
# Find resized luns
findresized()
{
local devs=
local size=
local new_size=
local sysfs_path=
local sddev=
local i=
local m=
local mpathsize=
declare -a mpathsizes
if [ -z "$lunsearch" ] ; then
devs=$(ls /sys/class/scsi_device/)
else
for lun in $lunsearch ; do
devs="$devs $(cd /sys/class/scsi_device/ && ls -d *:${lun})"
done
fi
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 "${yellow}RESIZED: %s" "$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 [ -n "$mp_enable" ] && [ -n "$mpaths" ] ; then
i=0
for m in $mpaths ; do
mpathsizes[$i]="$($MULTIPATH -l "$m" | egrep -o [0-9]+.[0-9]+[KMGT])"
let i=$i+1
done
resizempaths
i=0
for m in $mpaths ; do
mpathsize="$($MULTIPATH -l "$m" | egrep -o [0-9\.]+[KMGT])"
echo "$m ${mpathsizes[$i]} => $mpathsize"
let i=$i+1
done
fi
}
FOUNDDEVS=""
CHGDEVS=""
RMVDDEVS=""
# main
if [ "@$1" = @--help ] || [ "@$1" = @-h ] || [ "@$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 " -c enables scanning of channels 0 1 [default: 0 / all detected ones]"
echo " -d enable debug [default: 0]"
echo " -f flush failed multipath devices [default: disabled]"
echo " -h help: print this usage message then exit"
echo " -i issue a FibreChannel LIP reset [default: disabled]"
echo " -I SECS issue a FibreChannel LIP reset and wait for SECS seconds [default: disabled]"
echo " -l activates scanning for LUNs 0--7 [default: 0]"
echo " -L NUM activates scanning for LUNs 0--NUM [default: 0]"
echo " -m update multipath devices [default: disabled]"
echo " -r enables removing of devices [default: disabled]"
echo " -s look for resized disks and reload associated multipath devices, if applicable"
echo " -u look for existing disks that have been remapped"
echo " -V print version date then exit"
echo " -w scan for target device IDs 0--15 [default: 0--7]"
echo "--alltargets: same as -a"
echo "--attachpq3: Tell kernel to attach sg to LUN 0 that reports PQ=3"
echo "--channels=LIST: Scan only channel(s) in LIST"
echo "--color: use coloured prefixes OLD/NEW/DEL"
echo "--flush: same as -f"
echo "--forceremove: Remove stale devices (DANGEROUS)"
echo "--forcerescan: Remove and readd existing devices (DANGEROUS)"
echo "--help: print this usage message then exit"
echo "--hosts=LIST: Scan only host(s) in LIST"
echo "--ids=LIST: Scan only target ID(s) in LIST"
echo "--ignore-rev: Ignore the revision change"
echo "--issue-lip: same as -i"
echo "--issue-lip-wait=SECS: same as -I"
echo "--largelun: Tell kernel to support LUNs > 7 even on SCSI2 devs"
echo "--luns=LIST: Scan only lun(s) in LIST"
echo "--multipath: same as -m"
echo "--nooptscan: don't stop looking for LUNs if 0 is not found"
echo "--remove: same as -r"
echo "--reportlun2: Tell kernel to try REPORT_LUN even on SCSI2 devices"
echo "--resize: same as -s"
echo "--sparselun: Tell kernel to support sparse LUN numbering"
echo "--sync/nosync: Issue a sync / no sync [default: sync if remove]"
echo "--update: same as -u"
echo "--version: same as -V"
echo "--wide: same as -w"
echo ""
echo "Host numbers may thus be specified either directly on cmd line (deprecated)"
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 [ "@$1" = @--version ] || [ "@$1" = @-V ] ; then
echo ${VERSION}
exit 0
fi
if [ ! -d /sys/class/scsi_host/ ] && [ ! -d /proc/scsi/ ] ; then
echo "Error: SCSI subsystem not active"
exit 1
fi
# Make sure sg is there
modprobe sg >/dev/null 2>&1
if [ -x /usr/bin/sg_inq ] ; then
sg_version=$(sg_inq -V 2>&1 | cut -d " " -f 3)
if [ -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 "$sg_version" ] || [ "$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=
lipreset=-1
declare -i scan_flags=0
ignore_rev=0
# Scan options
opt="$1"
while [ ! -z "$opt" ] && [ -z "${opt##-*}" ] ; do
opt=${opt#-}
case "$opt" in
a) existing_targets=;; #Scan ALL targets when specified
c) opt_channelsearch="0 1" ;;
d) debug=1 ;;
f) flush=1 ;;
i) lipreset=0 ;;
I) shift; lipreset=$opt ;;
l) lunsearch=$(seq 0 7) ;;
L) lunsearch=$(seq 0 "$2"); shift ;;
m) mp_enable=1 ;;
r) remove=1 ;;
s) resize=1; mp_enable=1 ;;
u) update=1 ;;
w) opt_idsearch=$(seq 0 15) ;;
-alltargets) existing_targets=;;
-attachpq3) scan_flags=$((scan_flags|0x1000000)) ;;
-channels=*) arg=${opt#-channels=};opt_channelsearch=$(expandlist "$arg") ;;
-color) setcolor ;;
-flush) flush=1 ;;
-forceremove) remove=1; forceremove=1 ;;
-forcerescan) remove=1; forcerescan=1 ;;
-hosts=*) arg=${opt#-hosts=}; hosts=$(expandlist "$arg") ;;
-ids=*) arg=${opt#-ids=}; opt_idsearch=$(expandlist "$arg") ; filter_ids=1;;
-ignore-rev) ignore_rev=1;;
-issue-lip) lipreset=0 ;;
-issue-lip-wait) lipreset=${opt#-issue-lip-wait=};;
-largelun) scan_flags=$((scan_flags|0x200)) ;;
-luns=*) arg=${opt#-luns=}; lunsearch=$(expandlist "$arg") ;;
-multipath) mp_enable=1 ;;
-nooptscan) optscan=0 ;;
-nosync) sync=0 ;;
-remove) remove=1 ;;
-reportlun2) scan_flags=$((scan_flags|0x20000)) ;;
-resize) resize=1;;
-sparselun) scan_flags=$((scan_flags|0x40)) ;;
-sync) sync=2 ;;
-update) update=1;;
-wide) opt_idsearch=$(seq 0 15) ;;
*) echo "Unknown option -$opt !" ;;
esac
shift
opt="$1"
done
if [ -z "$hosts" ] ; then
if [ -d /sys/class/scsi_host ] ; then
findhosts_26
else
findhosts
fi
fi
if [ -d /sys/class/scsi_host ] && [ ! -w /sys/class/scsi_host ]; then
echo "You need to run scsi-rescan-bus.sh as root"
exit 2
fi
[ "$sync" = 1 ] && [ "$remove" = 1 ] && sync=2
if [ "$sync" = 2 ] ; then
echo "Syncing file systems"
sync
fi
if [ -w /sys/module/scsi_mod/parameters/default_dev_flags ] && [ $scan_flags != 0 ] ; then
OLD_SCANFLAGS=$(cat /sys/module/scsi_mod/parameters/default_dev_flags)
NEW_SCANFLAGS=$((OLD_SCANFLAGS|scan_flags))
if [ "$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 "$MULTIPATH" ] && flush= && mp_enable=
echo -n "Scanning SCSI subsystem for new devices"
[ -z "$flush" ] || echo -n ", flush failed multipath devices,"
[ -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
# If you've changed the mapping, there's a chance it's a different size
mpaths=""
findresized
# 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 $host "
if [ -e "/sys/class/fc_host/host$host" ] ; then
# It's pointless to do a target scan on FC
issue_lip=/sys/class/fc_host/host$host/issue_lip
if [ -e "$issue_lip" ] && [ "$lipreset" -ge 0 ] ; then
echo 1 > "$issue_lip" 2> /dev/null;
udevadm_settle
[ "$lipreset" -gt 0 ] && sleep "$lipreset"
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 [ -n "$OLD_SCANFLAGS" ] ; then
echo "$OLD_SCANFLAGS" > /sys/module/scsi_mod/parameters/default_dev_flags
fi
fi
let rmvd_found=$rmvd+$found
if [ -n "$mp_enable" ] && [ $rmvd_found -gt 0 ] ; then
echo "Attempting to update multipath devices..."
if [ $rmvd -gt 0 ] ; then
udevadm_settle
echo "Removing multipath mappings for removed devices if all paths are now failed... "
flushmpaths 1
fi
if [ $found -gt 0 ] ; then
/bin/udevadm trigger --sysname-match=sd*
udevadm_settle
if [ -x "$MULTIPATH" ] ; then
echo "Trying to discover new multipath mappings for newly discovered devices... "
$MULTIPATH | grep "create:" 2> /dev/null
fi
fi
fi
echo "$found new or changed device(s) found. "
if [ ! -z "$FOUNDDEVS" ] ; then
printf "%s" "$FOUNDDEVS"
fi
echo "$updated remapped or resized device(s) found."
if [ ! -z "$CHGDEVS" ] ; then
printf "%s" "$CHGDEVS"
fi
echo "$rmvd device(s) removed. "
if [ ! -z "$RMVDDEVS" ] ; then
printf "%s" "$RMVDDEVS"
fi
# Local Variables:
# sh-basic-offset: 2
# End:
Mini Shell