428 lines
8.6 KiB
Bash
Executable file
428 lines
8.6 KiB
Bash
Executable file
#!/bin/sh
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# provide the shortest possible unique hardware path to a device
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# for the Linux Persistent Device Naming scheme
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#
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# Copyright (C) 2005-2006 SUSE Linux Products GmbH
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# Author:
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# Hannes Reinecke <hare@suse.de>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation version 2 of the License.
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#
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# to be called from a udev rule to return the name for a symlink
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# DEVPATH=<devpath>; path_id
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# path_id <devpath>
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# examples for all block devices on a system:
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# for i in `find /sys/class/block`; do DEVPATH="`echo $i | sed -e 's@^/sys\|/dev@@g'`"; path_id; done
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SYSFS=/sys
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RESULT=1
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TYPE=
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OPWD="`pwd`"
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full_sysfs_path=
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full_sysfs_device_path=
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if [ -z "$DEVPATH" -a -z "$1" ] ; then
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exit 1
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fi
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if [ -z "$DEVPATH" ] ; then
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case "$1" in
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$SYSFS/*)
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DEVPATH="${1#$SYSFS}"
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;;
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*)
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DEVPATH=$1
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;;
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esac
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fi
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if [ ! -e $SYSFS$DEVPATH/dev ] ; then
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exit 1
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fi
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case "$DEVPATH" in
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/devices/*)
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cd "$SYSFS$DEVPATH/subsystem";
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TYPE="`pwd -P`"
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cd "$OPWD"
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TYPE="${TYPE##*/}"
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;;
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/class/*)
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TYPE="${DEVPATH#/class/}"
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TYPE="${TYPE%%/*}"
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;;
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/block/*)
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TYPE=block
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;;
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*)
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exit 1
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;;
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esac
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get_port_offset () {
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local type offset port
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type=$1
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offset=$2
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for i in $type[0-9]* ; do
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: i $i
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port="${i#$type}"
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if [ "$port" -lt "$offset" ] ; then offset=$port ; fi
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done
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echo $offset
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}
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handle_pci () {
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local DEV=$1
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cd -P $1
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DEV=${PWD}
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pci_id=${DEV##*/}
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host_dev_path=$DEV
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while [ ! -z "$host_dev_path" ] ; do
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case "$host_dev_path" in
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*/pci[0-9]*)
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host_dev_path=${host_dev_path%/*}
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;;
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*)
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break
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;;
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esac
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done
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d="pci-$pci_id-$d"
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D="$host_dev_path"
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RESULT=0
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}
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handle_ide () {
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: handle_ide $*
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local DEV=$1
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local port idedev idecontroller
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# IDE
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: DEV $DEV
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port=${DEV##*/}
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idedev=${DEV%/*}
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idecontroller=${idedev%/*}
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# port info if the controller has more than one interface
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port="${port#ide}"
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: port $port d $d
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: idedev $idedev kernel_port $port
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case "${port#*.}" in
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0)
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channel=0
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;;
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1)
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channel=1
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;;
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*)
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echo "Error: $idedev is neither master or slave" >&2
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;;
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esac
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cd $idecontroller
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offset="`get_port_offset ide ${port%.*}`"
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cd "$OPWD"
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: port offset $offset
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port=$((${port%.*} - $offset))
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if [ "$d" ] ; then
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d="ide-${port}:$channel-$d"
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else
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d="ide-${port}:$channel"
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fi
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D=$idecontroller
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RESULT=0
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}
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handle_scsi () {
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: handle_scsi $*
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local DEV=$1
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local cil controller_port controller_dev
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# SCSI device
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cil="${DEV##*/}"
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cil="${cil#*:}"
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target_dev=${DEV%/*}
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target_id=${target_dev##*/target}
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cd "$target_dev"
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target_num=0
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for tid in ${target_id}* ; do
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target_num=$(( $target_num + 1 ))
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done
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controller_port=${target_dev%/*}
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controller_dev="${controller_port%/*}"
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: controller_dev $controller_dev
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: controller_port $controller_port
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# a host controller may have more than one interface/port
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controller_port="${controller_port##*/host}"
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#
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cd "$controller_dev"
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controller_offset=$(get_port_offset host $controller_port)
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cd "$OPWD"
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controller_port=$(( $controller_port - $controller_offset))
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scsi_id="scsi-${controller_port}:${cil}"
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if [ "$d" ] ; then
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d="${scsi_id}-$d"
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else
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d="$scsi_id"
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fi
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D="$controller_dev"
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RESULT=0
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}
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handle_firewire () {
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:handle_firewire $*
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local DEV=$1
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if [ -f "$D/ieee1394_id" ] ; then
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read ieee1394_id < $D/ieee1394_id
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fi
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if [ -z "$ieee1394_id" ] ; then
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: no IEEE1394 ID
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RESULT=1
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return
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fi
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fw_host_dev=${DEV%/fw-host*}
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# IEEE1394 devices are always endpoints
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d="ieee1394-0x$ieee1394_id"
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D="$fw_host_dev"
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RESULT=0
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}
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handle_fc () {
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: handle_fc $*
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local DEV=$1
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local cil controller_port controller_dev
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# SCSI-FC device
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fc_tgt_hcil="${DEV##*/}"
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fc_tgt_lun="${fc_tgt_hcil##*:}"
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fc_tgt_path="${DEV%/*}"
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fc_tgt_num="${fc_tgt_path##*/}"
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fc_tgt_dev="${fc_tgt_path}/fc_transport:${fc_tgt_num}"
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if [ -e "$fc_tgt_dev/port_name" ]; then
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read wwpn < $fc_tgt_dev/port_name
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fi
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if [ -z "$wwpn" ] ; then
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: no WWPN
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RESULT=1
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return
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fi
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# Linux currently knows about 32bit luns
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tmp_lun3=$(printf "%04x" $(($fc_tgt_lun & 0xFFFF)))
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tmp_lun2=$(printf "%04x" $(( ($fc_tgt_lun >> 16) & 0xFFFF)))
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tmp_lun1="0000"
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tmp_lun0="0000"
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if (($fc_tgt_lun == 0)) ; then
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lun="0x0000000000000000"
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else
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lun="0x${tmp_lun3}${tmp_lun2}${tmp_lun1}${tmp_lun0}"
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fi
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controller_dev="${fc_tgt_path%/host[0-9]*}"
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# FC devices are always endpoints
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d="fc-${wwpn}:${lun}"
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D="$controller_dev"
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RESULT=0
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}
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handle_sas () {
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: handle_sas $*
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local DEV=$1
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local cil adapter controller_dev
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# SAS device
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sas_host_path="${DEV%%/phy*}"
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sas_phy_path="${DEV#*/host*/}"
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sas_phy_path="${sas_phy_path%%/target*}"
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sas_phy_id="${sas_phy_path%%/*}"
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sas_rphy_id="${sas_phy_path##*/}"
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sas_phy_dev="${sas_host_path}/${sas_phy_id}/sas_phy:${sas_phy_id}"
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if [ -e "$sas_phy_dev/sas_address" ]; then
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read phy_address < $sas_phy_dev/sas_address
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read phy_port < $sas_phy_dev/port_identifier
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read phy_id < $sas_phy_dev/phy_identifier
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fi
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if [ -z "$phy_address" ] ; then
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: no initiator address
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RESULT=1
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return
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fi
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sas_phy_address="$phy_address:$phy_port:$phy_id"
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sas_rphy_dev="${sas_host_path}/${sas_phy_id}/${sas_rphy_id}/sas_rphy:${sas_rphy_id}"
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if [ -e "$sas_rphy_dev/sas_address" ]; then
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read rphy_address < $sas_rphy_dev/sas_address
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read rphy_id < $sas_rphy_dev/phy_identifier
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fi
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if [ -z "$rphy_address" ] ; then
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: no initiator address
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RESULT=1
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return
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fi
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sas_rphy_address="$rphy_address:$rphy_id"
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controller_dev="${sas_host_path%/host[0-9]*}"
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# SAS devices are always endpoints
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d="sas-${sas_phy_address}-${sas_rphy_address}"
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D="$controller_dev"
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RESULT=0
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}
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handle_usb () {
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: handle_usb $*
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local DEV=$1
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cd -P $1
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DEV=${PWD}
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port_id=${DEV##*/}
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port_num=${port_id#*-}
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host_dev_path=$DEV
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while [ ! -z "$host_dev_path" ] ; do
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case "$host_dev_path" in
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*/usb*)
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usb_host_path=$host_dev_path
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host_dev_path="${host_dev_path%/*}"
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;;
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*)
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break
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;;
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esac
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done
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: host_dev_path $host_dev_path
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usb_host_num=${usb_host_path##*/usb}
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cd "$host_dev_path"
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usb_host_offset=$(get_port_offset usb $usb_host_num)
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usb_host_port=$(($usb_host_num - $usb_host_offset))
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cd "$OPWD"
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if [ "$d" ] ; then
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d="usb-$usb_host_port:$port_num-${d}"
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else
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d="usb-$usb_host_port:$port_num"
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fi
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D="$host_dev_path"
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RESULT=0
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}
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handle_device () {
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full_sysfs_path="$SYSFS$DEVPATH"
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if [ -L $full_sysfs_path/subsystem ]; then
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# new sysfs block layout
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full_sysfs_path="${full_sysfs_path%/*}"
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cd "$full_sysfs_path/subsystem";
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subsys="`pwd -P`"
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cd "$OPWD"
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subsys="${subsys##*/}"
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if [ "$subsys" == "block" ]; then
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# parent is "block", it's a partition, move one up
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full_sysfs_path="${full_sysfs_path%/*}"
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fi
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cd $full_sysfs_path
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else
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# old sysfs block layout
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if [ ! -L $full_sysfs_path/device ] ; then
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if [ -f $full_sysfs_path/range ] ; then return ; fi
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full_sysfs_path="${full_sysfs_path%/*}"
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: full_sysfs_path "$full_sysfs_path"
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if [ ! -L $full_sysfs_path/device -o ! -f $full_sysfs_path/dev ] ; then
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return
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fi
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fi
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cd $full_sysfs_path/device
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fi
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full_sysfs_device_path="`pwd -P`"
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cd "$OPWD"
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D=$full_sysfs_device_path
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while [ ! -z "$D" ] ; do
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case "$D" in
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*/ide[0-9]/[0-9].[0-9]*|*/ide[0-9][0-9]/[0-9][0-9].[0-9]*)
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handle_ide "$D"
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;;
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*/css0/*)
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if [ -r $full_sysfs_device_path/wwpn ]; then
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read wwpn < $full_sysfs_device_path/wwpn
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fi
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if [ -r $full_sysfs_device_path/fcp_lun ]; then
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read lun < $full_sysfs_device_path/fcp_lun
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fi
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if [ -r $full_sysfs_device_path/hba_id ]; then
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read bus_id < $full_sysfs_device_path/hba_id
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fi
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if [ "$bus_id" -a "$wwpn" -a "$lun" ]; then
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# S/390 zfcp adapter
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d="ccw-$bus_id-zfcp-$wwpn:$lun"
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RESULT=0
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else
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# DASD devices
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bus="ccw"
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adapter=${D##*/}
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d="$bus-$adapter"
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RESULT=0
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fi
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D=
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;;
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*/rport-[0-9]*:[0-9]*-[0-9]*/*)
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handle_fc "$D"
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;;
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*/phy-[0-9]*:[0-9]*/*)
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handle_sas "$D"
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;;
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*/fw-host[0-9]*/*)
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handle_firewire "$D"
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;;
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*/host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
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handle_scsi "$D"
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;;
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*/usb[0-9]*/[0-9]*/*)
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handle_usb "$D"
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;;
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*/pci[0-9]*:[0-9]*)
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handle_pci "$D"
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;;
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*/devices)
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D=
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;;
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*)
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: not handled
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RESULT=1
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return
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;;
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esac
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done
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if [ "$TYPE" == "scsi_tape" ] ; then
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devname=${full_sysfs_path##*/}
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rewind="${devname%%st*}"
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mode="${devname##*st}"
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case "$mode" in
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*l)
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mode="l"
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;;
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*m)
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mode="m"
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;;
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*a)
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mode="a"
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;;
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*)
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mode=""
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;;
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esac
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if [ "$d" ]; then
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d="$d-${rewind}st${mode}"
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fi
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fi
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}
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case "$TYPE" in
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block)
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handle_device
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echo "ID_PATH=$d"
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;;
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scsi_tape)
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handle_device
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echo "ID_PATH=$d"
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;;
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input)
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handle_device
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echo "ID_PATH=$d"
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;;
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*)
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RESULT=1
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;;
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esac
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exit $RESULT
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