Personal Computer World 2007 September/PCWSEP07.iso/Software/Linux/Linux Mint 3.0 Light/LinuxMint-3.0-Light.iso/casper/filesystem.squashfs/lib/udev/path_id

Text File | 2007-04-10 | 11.4 KB | 565 lines

#!/bin/sh

# provide the shortest possible unique hardware path to a device
# for the Linux Persistent Device Naming scheme
#
# Copyright (C) 2005-2006 SUSE Linux Products GmbH
# Author:
#    Hannes Reinecke <[e-mail]>
#
#    This program is free software; you can redistribute it and/or modify it
#    under the terms of the GNU General Public License as published by the
#    Free Software Foundation version 2 of the License.
#
# to be called from a udev rule to return the name for a symlink
#    DEVPATH=<devpath>; path_id
#    path_id <devpath>

# examples for all block devices on a system:
#    for i in `find /sys/class/block`; do DEVPATH="`echo $i | sed -e 's@^/sys\|/dev@@g'`"; path_id; done

SYSFS=/sys
RESULT=1
TYPE=
OPWD="`pwd`"
full_sysfs_path=
full_sysfs_device_path=

if [ -z "$DEVPATH" -a -z "$1" ] ; then
    exit 1
fi

if [ -z "$DEVPATH" ] ; then
    case "$1" in
        $SYSFS/*)
            DEVPATH="${1#$SYSFS}"
            ;;
        *)
            DEVPATH=$1
            ;;
    esac
fi

if [ ! -e $SYSFS$DEVPATH/dev ] ; then
    exit 1
fi

case "$DEVPATH" in
    /devices/*)
        cd "$SYSFS$DEVPATH/subsystem";
        TYPE="`pwd -P`"
        cd "$OPWD"
        TYPE="${TYPE##*/}"
        ;;
    /class/*)
        TYPE="${DEVPATH#/class/}"
        TYPE="${TYPE%%/*}"
        ;;
    /block/*)
        TYPE=block
        ;;
    *)
        exit 1
        ;;
esac

get_port_offset () {
    local type offset port
    type=$1
    offset=$2
    for i in $type[0-9]* ; do
        : i $i
        port="${i#$type}"
        if [ "$port" -lt "$offset" ] ; then offset=$port ; fi
    done
    echo $offset
}

handle_pci () {
    local DEV=$1
    cd -P $1
    DEV=${PWD}
    pci_id=${DEV##*/}
    host_dev_path=$DEV
    while [ ! -z "$host_dev_path" ] ; do
        case "$host_dev_path" in
            */pci[0-9]*)
                host_dev_path=${host_dev_path%/*}
                ;;
            *)
                break
                ;;
        esac
    done
    d="pci-$pci_id-$d"
    D="$host_dev_path"
    RESULT=0
}

handle_platform () {
    local DEV=$1
    cd -P $1
    DEV=${PWD}
    platform_id=${DEV##*/}
    host_dev_path=$DEV
    while [ ! -z "$host_dev_path" ] ; do
        case "$host_dev_path" in
            */platform*)
                host_dev_path=${host_dev_path%/*}
                ;;
            *)
                break
                ;;
        esac
    done
    if [ "$d" ]; then
        d="platform-$platform_id-$d"
    else
        d="platform-$platform_id"
    fi
    D="$host_dev_path"
    RESULT=0
}

handle_serio () {
    local DEV=$1
    cd -P $1
    DEV=${PWD}
    serio_id=${DEV##*/serio}
    host_dev_path=$DEV
    while [ ! -z "$host_dev_path" ] ; do
        case "$host_dev_path" in
            */serio*)
                host_dev_path=${host_dev_path%/*}
                ;;
            *)
                break
                ;;
        esac
    done
    if [ "$d" ]; then
        d="serio-$serio_id-$d"
    else
        d="serio-$serio_id"
    fi
    D="$host_dev_path"
    RESULT=0
}

handle_ide () {
    : handle_ide $*
    local DEV=$1
    local port idedev idecontroller
    # IDE
    : DEV $DEV
    port=${DEV##*/}
    idedev=${DEV%/*}
    idecontroller=${idedev%/*}
    # port info if the controller has more than one interface
    port="${port#ide}"
    : port $port d $d
    : idedev $idedev kernel_port $port
    case "${port#*.}" in
        0)
            channel=0
            ;;
        1)
            channel=1
            ;;
        *)
            echo "Error: $idedev is neither master or slave" >&2
            ;;
    esac
    cd $idecontroller
    offset="`get_port_offset ide ${port%.*}`"
    cd "$OPWD"
    :  port offset $offset
    port=$((${port%.*} - $offset))
    if [ "$d" ] ; then
        d="ide-${port}:$channel-$d"
    else
        d="ide-${port}:$channel"
    fi
    D=$idecontroller
    RESULT=0
}

handle_scsi () {
    : handle_scsi $*
    local DEV=$1
    local cil controller_port controller_dev
    # SCSI device
    cil="${DEV##*/}"
    cil="${cil#*:}"
    target_dev=${DEV%/*}
    target_id=${target_dev##*/target}
    cd "$target_dev"
    target_num=0
    for tid in ${target_id}* ; do
        target_num=$(( $target_num + 1 ))
    done
    controller_port=${target_dev%/*}
    controller_dev="${controller_port%/*}"
    : controller_dev $controller_dev
    : controller_port $controller_port
    # a host controller may have more than one interface/port
    controller_port="${controller_port##*/host}"
    #
    cd "$controller_dev"
    controller_offset=$(get_port_offset host $controller_port)
    cd "$OPWD"
    controller_port=$(( $controller_port - $controller_offset))
    scsi_id="scsi-${controller_port}:${cil}"
    if [ "$d" ] ; then
        d="${scsi_id}-$d"
    else
        d="$scsi_id"
    fi
    D="$controller_dev"
    RESULT=0
}

handle_firewire () {
    : handle_firewire $*
    local DEV=$1
    if [ -f "$D/ieee1394_id" ] ; then
        read ieee1394_id < $D/ieee1394_id
    fi
    if [ -z "$ieee1394_id" ] ; then
        : no IEEE1394 ID
        RESULT=1
        return
    fi
    fw_host_dev=${DEV%/fw-host*}
    # IEEE1394 devices are always endpoints
    d="ieee1394-0x$ieee1394_id"
    D="$fw_host_dev"
    RESULT=0
}

handle_fc () {
    : handle_fc $*
    local DEV=$1
    local cil controller_port controller_dev
    # SCSI-FC device
    fc_tgt_hcil="${DEV##*/}"
    fc_tgt_lun="${fc_tgt_hcil##*:}"
    fc_tgt_path="${DEV%/*}"
    fc_tgt_num="${fc_tgt_path##*/}"
    fc_tgt_dev="${fc_tgt_path}/fc_transport:${fc_tgt_num}"
    if [ -e "$fc_tgt_dev/port_name" ]; then
        read wwpn < $fc_tgt_dev/port_name
    fi
    if [ -z "$wwpn" ] ; then
        : no WWPN
        D=
        RESULT=1
        return
    fi
    # Linux currently knows about 32bit luns
    tmp_lun3=$(printf "%04x" $(($fc_tgt_lun & 0xFFFF)))
    tmp_lun2=$(printf "%04x" $(( ($fc_tgt_lun >> 16) & 0xFFFF)))
    tmp_lun1="0000"
    tmp_lun0="0000"
    if (($fc_tgt_lun == 0)) ; then
        lun="0x0000000000000000"
    else
        lun="0x${tmp_lun3}${tmp_lun2}${tmp_lun1}${tmp_lun0}"
    fi
    controller_dev="${fc_tgt_path%/host[0-9]*}"
    # FC devices are always endpoints
    d="fc-${wwpn}:${lun}"
    D="$controller_dev"
    RESULT=0
}

handle_sas () {
    : handle_sas $*
    local DEV=$1
    local cil adapter controller_dev
    # SAS device
    sas_host_path="${DEV%%/port*}"
    sas_phy_path="${DEV#*/host*/}"
    sas_phy_path="${sas_phy_path%%/target*}"
    sas_phy_id="${sas_phy_path%%/*}"
    sas_phy_id="${sas_phy_id##*port-}"
    sas_port_id="${sas_phy_path%%/end_device*}"
    sas_port_id="${sas_port_id##*port-}"
    sas_end_id="${sas_phy_path##*end_device-}"
    sas_phy_dev="/sys/class/sas_phy/phy-${sas_phy_id}"
    if [ -e "$sas_phy_dev/sas_address" ]; then
        read phy_address < $sas_phy_dev/sas_address
        read phy_id < $sas_phy_dev/phy_identifier
    fi
    if [ -z "$phy_address" ] ; then
        : no initiator address
        D=
        RESULT=1
        return
    fi
    sas_port_dev="/sys/class/sas_port/port-${sas_port_id}"
    if [ -e "$sas_port_dev/num_phys" ] ; then
        read phy_port < $sas_port_dev/num_phys
    fi
    if [ -z "$phy_port" ] ; then
        : no initiator address
        D=
        RESULT=1
        return
    fi
    sas_phy_address="$phy_address:$phy_port:$phy_id"
    sas_end_dev="/sys/class/sas_device/end_device-${sas_end_id}"
    if [ -e "$sas_end_dev/sas_address" ]; then
        read end_address < $sas_end_dev/sas_address
        read end_id < $sas_end_dev/phy_identifier
    fi
    if [ -z "$end_address" ] ; then
        : no initiator address
        D=
        RESULT=1
        return
    fi
    sas_end_address="$end_address:$end_id"
    controller_dev="${sas_host_path%/host[0-9]*}"
    # SAS devices are always endpoints
    d="sas-${sas_phy_address}-${sas_end_address}"
    D="$controller_dev"
    RESULT=0
}

handle_iscsi() {
    local DEV=$1
    local iscsi_session_dir
    local iscsi_session iscsi_session_path
    local iscsi_connection iscsi_connection_path
    local iscsi_scsi_lun
    # iSCSI device
    iscsi_session_dir="${DEV%%/target*}"
    iscsi_session="${iscsi_session_dir##*/}"
    iscsi_session_path=/sys/class/iscsi_session/${iscsi_session}
    if [ ! -d "$iscsi_session_path" ] ; then
        : no iSCSI session path
        RESULT=1
        return
    fi
    # Currently we're not doing MC/S
    for conn in ${iscsi_session_dir}/connection* ; do
        iscsi_conn_num=${conn##*:}
        if [ "$iscsi_conn_num" = '0' ] ; then
        iscsi_connection=$(basename $conn)
        fi
    done
    if [ -z "$iscsi_connection" ] ; then
        : no iSCSI connection found
        RESULT=1
        return
    fi
    iscsi_connection_path=/sys/class/iscsi_connection/${iscsi_connection}
    if [ ! -d "$iscsi_connection_path" ] ; then
        : no iSCSI connection path
        RESULT=1
        return
    fi
    if [ -e "${iscsi_session_path}/targetname" ]; then
        read iscsi_tgtname < ${iscsi_session_path}/targetname
    fi
    if [ -z "$iscsi_tgtname" ] ; then
        : No iSCSI Targetname
        RESULT=1
        return
    fi
    if [ -e "${iscsi_connection_path}/persistent_address" ] ; then
        read iscsi_address < ${iscsi_connection_path}/persistent_address
    fi
    if [ -z "$iscsi_address" ] ; then
        : No iSCSI Target address
        RESULT=1
        return
    fi
    if [ -e "${iscsi_connection_path}/persistent_port" ] ; then
        read iscsi_port < ${iscsi_connection_path}/persistent_port
    fi
    iscsi_scsi_lun="${DEV##*:}"
    d="ip-${iscsi_address}:${iscsi_port}-iscsi-${iscsi_tgtname}-lun-${iscsi_scsi_lun}"
    RESULT=0
}

handle_usb () {
: handle_usb $*
    local DEV=$1
    cd -P $1
    DEV=${PWD}
    port_id=${DEV##*/}
    port_num=${port_id#*-}
    host_dev_path=$DEV
    while [ ! -z "$host_dev_path" ] ; do
        case "$host_dev_path" in
            */usb*)
                usb_host_path=$host_dev_path
                host_dev_path="${host_dev_path%/*}"
                ;;
            *)
                break
                ;;
        esac
    done
    : host_dev_path $host_dev_path
    usb_host_num=${usb_host_path##*/usb}

    cd "$host_dev_path"
    usb_host_offset=$(get_port_offset usb $usb_host_num)
    usb_host_port=$(($usb_host_num - $usb_host_offset))
    cd "$OPWD"
    if [ "$d" ] ; then
        d="usb-$usb_host_port:$port_num-${d}"
    else
        d="usb-$usb_host_port:$port_num"
    fi
    D="$host_dev_path"
    RESULT=0
}

handle_device () {
    full_sysfs_path="$SYSFS$DEVPATH"
    case "$DEVPATH" in
        /devices/*)
            # new sysfs layout
            if [ -L $full_sysfs_path/subsystem ]; then
                full_sysfs_path="${full_sysfs_path%/*}"
                cd "$full_sysfs_path/subsystem";
                subsys="`pwd -P`"
                cd "$OPWD"
                subsys="${subsys##*/}"
                if [ "$subsys" = "block" ]; then
                    # parent is "block", it's a partition, move one up
                full_sysfs_path="${full_sysfs_path%/*}"
                fi
                cd $full_sysfs_path
            fi
            ;;
        *)
            # old sysfs layout
            if [ ! -L $full_sysfs_path/device ] ; then
                if [ -f $full_sysfs_path/range ] ; then return ; fi
                full_sysfs_path="${full_sysfs_path%/*}"
                : full_sysfs_path "$full_sysfs_path"
                if [ ! -L $full_sysfs_path/device -o ! -f $full_sysfs_path/dev ] ; then
                    return
                fi
            fi
            cd $full_sysfs_path/device
            ;;
    esac
    full_sysfs_device_path="`pwd -P`"
    cd "$OPWD"
    D=$full_sysfs_device_path
    while [ ! -z "$D" ] ; do
        case "$D" in
            */ide[0-9]/[0-9].[0-9]*|*/ide[0-9][0-9]/[0-9][0-9].[0-9]*)
                handle_ide "$D"
                ;;
            */css0/*)
                if [ -r $full_sysfs_device_path/wwpn ]; then
                    read wwpn < $full_sysfs_device_path/wwpn
                fi
                if [ -r $full_sysfs_device_path/fcp_lun ]; then
                    read lun < $full_sysfs_device_path/fcp_lun
                fi
                if [ -r $full_sysfs_device_path/hba_id ]; then
                    read bus_id < $full_sysfs_device_path/hba_id
                fi
                if [ "$bus_id" -a "$wwpn" -a "$lun" ]; then
                    # S/390 zfcp adapter
                    d="ccw-$bus_id-zfcp-$wwpn:$lun"
                    RESULT=0
                else
                    # DASD devices
                    bus="ccw"
                    adapter=${D##*/}
                    d="$bus-$adapter"
                    RESULT=0
                fi
                D=
                ;;
            */rport-[0-9]*:[0-9]*-[0-9]*/*)
                handle_fc "$D"
                ;;
            */end_device-[0-9]*:[0-9]*:[0-9]*/*)
                handle_sas "$D"
                ;;
            */fw-host[0-9]*/*)
                handle_firewire "$D"
                ;;
            */session[0-9]*/*)
                handle_iscsi "$D"
                D=
                ;;
            */host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
                handle_scsi "$D"
                ;;
            */usb[0-9]*/[0-9]*/*)
                handle_usb "$D"
                ;;
            */pci[0-9]*:[0-9]*)
                handle_pci "$D"
                ;;
            */serio[0-9]*)
                handle_serio "$D"
                ;;
            */platform/*)
                handle_platform "$D"
                ;;
            */devices)
                D=
                ;;
            *)
                : not handled
                RESULT=1
                return
                ;;
        esac
    done
    if [ "$TYPE" = "scsi_tape" ] ; then
        devname=${full_sysfs_path##*/}
        rewind="${devname%%st*}"
        mode="${devname##*st}"
        case "$mode" in
            *l)
                mode="l"
                ;;
            *m)
                mode="m"
                ;;
            *a)
                mode="a"
                ;;
            *)
                mode=""
               ;;
        esac
        if [ "$d" ]; then
            d="$d-${rewind}st${mode}"
        fi
    fi
}

case "$TYPE" in
    block)
        handle_device
        echo "ID_PATH=$d"
        ;;
    scsi_tape)
        handle_device
        echo "ID_PATH=$d"
        ;;
    input)
        handle_device
        echo "ID_PATH=$d"
        ;;
    *)
        RESULT=1
        ;;
esac

exit $RESULT