From a187bc3ca5bb6c8d66e5942eaf33da7a9610c7c2 Mon Sep 17 00:00:00 2001

From: Harald Hoyer <harald@hoyer.xyz>

Date: Tue, 19 Dec 2017 14:39:07 +0100

Subject: [PATCH] Merge pull request #337 from danimo/lunmask

95lunmask: Add module to handle LUN masking

---

 modules.d/95lunmask/fc_transport_scan_lun.sh  | 26 ++++++++++

 modules.d/95lunmask/module-setup.sh           | 70 +++++++++++++++++++++++++++

 modules.d/95lunmask/parse-lunmask.sh          | 40 +++++++++++++++

 modules.d/95lunmask/sas_transport_scan_lun.sh | 26 ++++++++++

 4 files changed, 162 insertions(+)

diff --git a/modules.d/95lunmask/fc_transport_scan_lun.sh b/modules.d/95lunmask/fc_transport_scan_lun.sh

new file mode 100755

index 00000000..d9f84a38

--- /dev/null

+++ b/modules.d/95lunmask/fc_transport_scan_lun.sh

@@ -0,0 +1,26 @@

+#!/bin/bash

+#

+# fc_transport_lun_scan

+#

+# Selectively enable individual LUNs behind an FC remote port

+#

+# ACTION=="add", SUBSYSTEM=="fc_transport", ATTR{port_name}=="wwpn", \

+#    PROGRAM="fc_transport_lun_scan lun"

+#

+

+[ -z $DEVPATH ] && exit 1

+

+if [ -n "$1" ] ; then

+    LUN=$1

+else

+    LUN=-

+fi

+ID=${DEVPATH##*/rport-}

+HOST=${ID%%:*}

+CHANNEL=${ID%%-*}

+CHANNEL=${CHANNEL#*:}

+if [ -f /sys$DEVPATH/scsi_target_id ] ; then

+    TARGET=$(cat /sys$DEVPATH/scsi_target_id)

+fi

+[ -z "$TARGET" ] && exit 1

+echo $CHANNEL $TARGET $LUN > /sys/class/scsi_host/host$HOST/scan

diff --git a/modules.d/95lunmask/module-setup.sh b/modules.d/95lunmask/module-setup.sh

new file mode 100755

index 00000000..6afaed26

--- /dev/null

+++ b/modules.d/95lunmask/module-setup.sh

@@ -0,0 +1,70 @@

+#!/bin/bash

+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-

+# ex: ts=8 sw=4 sts=4 et filetype=sh

+

+# called by dracut

+cmdline() {

+    get_lunmask() {

+        local _dev=$1

+        local _devpath=$(cd -P /sys/dev/block/$_dev ; echo $PWD)

+        local _sdev _lun _rport _end_device _classdev _wwpn _sas_address

+

+        [ "${_devpath#*/sd}" == "$_devpath" ] && return 1

+        _sdev="${_devpath%%/block/*}"

+        _lun="${_sdev##*:}"

+        # Check for FibreChannel

+        _rport="${_devpath##*/rport-}"

+        if [ "$_rport" != "$_devpath" ] ; then

+            _rport="${_rport%%/*}"

+            _classdev="/sys/class/fc_remote_ports/rport-${_rport}"

+            [ -d "$_classdev" ] || return 1

+            _wwpn=$(cat ${_classdev}/port_name)

+            echo "rd.lunmask=fc,${_wwpn},${_lun}"

+            return 0

+        fi

+        # Check for SAS

+        _end_device="${_devpath##*/end_device-}"

+        if [ "$_end_device" != "$_devpath" ] ; then

+            _end_device="${_end_device%%/*}"

+            _classdev="/sys/class/sas_device/end_device-${_end_device}"

+            [ -e "$_classdev" ] || return 1

+            _sas_address=$(cat ${_classdev}/sas_address)

+            echo "rd.lunmask=sas,${_sas_address},${_lun}"

+            return 0

+        fi

+        return 1

+    }

+    [[ $hostonly ]] || [[ $mount_needs ]] && {

+        for_each_host_dev_and_slaves_all get_lunmask

+    } | sort | uniq

+}

+

+# called by dracut

+check() {

+    [[ $hostonly ]] || [[ $mount_needs ]] && {

+        [ -w /sys/module/scsi_mod/parameters/scan ] || return 255

+        scan_type=$(cat /sys/module/scsi_mod/parameters/scan)

+        [ "$scan_type" = "manual" ] && return 0

+        return 255

+    }

+    return 0

+}

+

+# called by dracut

+depends() {

+    return 0

+}

+

+# called by dracut

+install() {

+    inst_script "$moddir/fc_transport_scan_lun.sh" /usr/lib/udev/fc_transport_scan_lun.sh

+    inst_script "$moddir/sas_transport_scan_lun.sh" /usr/lib/udev/sas_transport_scan_lun.sh

+    inst_hook cmdline 30 "$moddir/parse-lunmask.sh"

+    if [[ $hostonly_cmdline == "yes" ]] ; then

+        local _lunmask

+

+        for _lunmask in $(cmdline) ; do

+            printf "%s\n" "$_lunmask" >> "${initdir}/etc/cmdline.d/95lunmask.conf"

+        done

+    fi

+}

diff --git a/modules.d/95lunmask/parse-lunmask.sh b/modules.d/95lunmask/parse-lunmask.sh

new file mode 100755

index 00000000..480f6147

--- /dev/null

+++ b/modules.d/95lunmask/parse-lunmask.sh

@@ -0,0 +1,40 @@

+#!/bin/sh

+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-

+# ex: ts=8 sw=4 sts=4 et filetype=sh

+

+create_udev_rule() {

+    local transport=$1

+    local tgtid=$2

+    local lun=$3

+    local _rule=/etc/udev/rules.d/51-${transport}-lunmask-${tgtid}.rules

+    local _cu_type _dev_type

+

+    [ -e ${_rule} ] && return 0

+

+    if [ ! -f "$_rule" ] ; then

+        if [ "$transport" = "fc" ] ; then

+            cat > $_rule <

+ACTION=="add", SUBSYSTEM=="fc_remote_ports", ATTR{port_name}=="$tgtid", PROGRAM="fc_transport_scan_lun.sh $lun"

+EOF

+        elif [ "$transport" = "sas" ] ; then

+            cat > $_rule <

+ACTION=="add", SUBSYSTEM=="sas_device", ATTR{sas_address}=="$tgtid", PROGRAM="sas_transport_scan_lun.sh $lun"

+EOF

+        fi

+    fi

+}

+

+for lunmask_arg in $(getargs rd.lunmask); do

+    (

+        local OLDIFS="$IFS"

+        local IFS=","

+        set $lunmask_arg

+        IFS="$OLDIFS"

+        if [ -d /sys/module/scsi_mod ] ; then

+            printf "manual" > /sys/module/scsi_mod/parameters/scan

+        elif [ ! -f /etc/modprobe.d/95lunmask.conf ] ; then

+            echo "options scsi_mod scan=manual" > /etc/modprobe.d/95lunmask.conf

+        fi

+        create_udev_rule $1 $2 $3

+    )

+done

diff --git a/modules.d/95lunmask/sas_transport_scan_lun.sh b/modules.d/95lunmask/sas_transport_scan_lun.sh

new file mode 100755

index 00000000..f7702f8b

--- /dev/null

+++ b/modules.d/95lunmask/sas_transport_scan_lun.sh

@@ -0,0 +1,26 @@

+#!/bin/bash

+#

+# sas_transport_lun_scan

+#

+# Selectively enable individual LUNs behind a SAS end device

+#

+# ACTION=="add", SUBSYSTEM=="sas_transport", ATTR{sas_address}=="sas_addr", \

+#    PROGRAM="sas_transport_lun_scan lun"

+#

+

+[ -z $DEVPATH ] && exit 1

+

+if [ -n "$1" ] ; then

+    LUN=$1

+else

+    LUN=-

+fi

+ID=${DEVPATH##*/end_device-}

+HOST=${ID%%:*}

+CHANNEL=${ID%%-*}

+CHANNEL=${CHANNEL#*:}

+if [ -f /sys$DEVPATH/scsi_target_id ] ; then

+    TARGET=$(cat /sys$DEVPATH/scsi_target_id)

+fi

+[ -z "$TARGET" ] && exit 1

+echo 0 $TARGET $LUN > /sys/class/scsi_host/host$HOST/scan