extras/path_id/path_id

   1 #!/bin/sh
   2
   3 # provide the shortest possible unique hardware path to a device
   4 # for the Linux Persistent Device Naming scheme
   5 #
   6 # Copyright (C) 2005-2006 SUSE Linux Products GmbH
   7 # Author:
   8 #       Hannes Reinecke <hare@suse.de>
   9 #
  10 #       This program is free software; you can redistribute it and/or modify it
  11 #       under the terms of the GNU General Public License as published by the
  12 #       Free Software Foundation version 2 of the License.
  13 #
  14 # to be called from a udev rule to return the name for a symlink
  15 #       DEVPATH=<devpath>; path_id
  16 #       path_id <devpath>
  17
  18 # examples for all block devices on a system:
  19 #       for i in `find /sys/class/block`; do DEVPATH="`echo $i | sed -e 's@^/sys\|/dev@@g'`"; path_id; done
  20
  21 SYSFS=/sys
  22 RESULT=1
  23 TYPE=
  24 OPWD="`pwd`"
  25 full_sysfs_path=
  26 full_sysfs_device_path=
  27
  28 if [ -z "$DEVPATH" -a -z "$1" ] ; then
  29         exit 1
  30 fi
  31
  32 if [ -z "$DEVPATH" ] ; then
  33         case "$1" in
  34                 $SYSFS/*)
  35                         DEVPATH="${1#$SYSFS}"
  36                         ;;
  37                 *)
  38                         DEVPATH=$1
  39                         ;;
  40         esac
  41 fi
  42
  43 if [ ! -e $SYSFS$DEVPATH/dev ] ; then
  44         exit 1
  45 fi
  46
  47 case "$DEVPATH" in
  48         /devices/*)
  49                 cd "$SYSFS$DEVPATH/subsystem";
  50                 TYPE="`pwd -P`"
  51                 cd "$OPWD"
  52                 TYPE="${TYPE##*/}"
  53                 ;;
  54         /class/*)
  55                 TYPE="${DEVPATH#/class/}"
  56                 TYPE="${TYPE%%/*}"
  57                 ;;
  58         /block/*)
  59                 TYPE=block
  60                 ;;
  61         *)
  62                 exit 1
  63                 ;;
  64 esac
  65
  66 get_port_offset () {
  67         local type offset port
  68         type=$1
  69         offset=$2
  70         for i in $type[0-9]* ; do
  71                 : i $i
  72                 port="${i#$type}"
  73                 if [ "$port" -lt "$offset" ] ; then offset=$port ; fi
  74         done
  75         echo $offset
  76 }
  77
  78 handle_pci () {
  79         local DEV=$1
  80         cd -P $1
  81         DEV=${PWD}
  82         pci_id=${DEV##*/}
  83         host_dev_path=$DEV
  84         while [ ! -z "$host_dev_path" ] ; do
  85                 case "$host_dev_path" in
  86                         */pci[0-9]*)
  87                                 host_dev_path=${host_dev_path%/*}
  88                                 ;;
  89                         *)
  90                                 break
  91                                 ;;
  92                 esac
  93         done
  94         d="pci-$pci_id-$d"
  95         D="$host_dev_path"
  96         RESULT=0
  97 }
  98
  99 handle_platform () {
 100         local DEV=$1
 101         cd -P $1
 102         DEV=${PWD}
 103         platform_id=${DEV##*/}
 104         host_dev_path=$DEV
 105         while [ ! -z "$host_dev_path" ] ; do
 106                 case "$host_dev_path" in
 107                         */platform*)
 108                                 host_dev_path=${host_dev_path%/*}
 109                                 ;;
 110                         *)
 111                                 break
 112                                 ;;
 113                 esac
 114         done
 115         if [ "$d" ]; then
 116                 d="platform-$platform_id-$d"
 117         else
 118                 d="platform-$platform_id"
 119         fi
 120         D="$host_dev_path"
 121         RESULT=0
 122 }
 123
 124 handle_serio () {
 125         local DEV=$1
 126         cd -P $1
 127         DEV=${PWD}
 128         serio_id=${DEV##*/serio}
 129         host_dev_path=$DEV
 130         while [ ! -z "$host_dev_path" ] ; do
 131                 case "$host_dev_path" in
 132                         */serio*)
 133                                 host_dev_path=${host_dev_path%/*}
 134                                 ;;
 135                         *)
 136                                 break
 137                                 ;;
 138                 esac
 139         done
 140         if [ "$d" ]; then
 141                 d="serio-$serio_id-$d"
 142         else
 143                 d="serio-$serio_id"
 144         fi
 145         D="$host_dev_path"
 146         RESULT=0
 147 }
 148
 149 handle_ide () {
 150         : handle_ide $*
 151         local DEV=$1
 152         local port idedev idecontroller
 153         # IDE
 154         : DEV $DEV
 155         port=${DEV##*/}
 156         idedev=${DEV%/*}
 157         idecontroller=${idedev%/*}
 158         # port info if the controller has more than one interface
 159         port="${port#ide}"
 160         : port $port d $d
 161         : idedev $idedev kernel_port $port
 162         case "${port#*.}" in
 163                 0)
 164                         channel=0
 165                         ;;
 166                 1)
 167                         channel=1
 168                         ;;
 169                 *)
 170                         echo "Error: $idedev is neither master or slave" >&2
 171                         ;;
 172         esac
 173         cd $idecontroller
 174         offset="`get_port_offset ide ${port%.*}`"
 175         cd "$OPWD"
 176         :  port offset $offset
 177         port=$((${port%.*} - $offset))
 178         if [ "$d" ] ; then
 179                 d="ide-${port}:$channel-$d"
 180         else
 181                 d="ide-${port}:$channel"
 182         fi
 183         D=$idecontroller
 184         RESULT=0
 185 }
 186
 187 handle_scsi () {
 188         : handle_scsi $*
 189         local DEV=$1
 190         local cil controller_port controller_dev
 191         # SCSI device
 192         cil="${DEV##*/}"
 193         cil="${cil#*:}"
 194         target_dev=${DEV%/*}
 195         target_id=${target_dev##*/target}
 196         cd "$target_dev"
 197         target_num=0
 198         for tid in ${target_id}* ; do
 199                 target_num=$(( $target_num + 1 ))
 200         done
 201         controller_port=${target_dev%/*}
 202         controller_dev="${controller_port%/*}"
 203         : controller_dev $controller_dev
 204         : controller_port $controller_port
 205         # a host controller may have more than one interface/port
 206         controller_port="${controller_port##*/host}"
 207         #
 208         cd "$controller_dev"
 209         controller_offset=$(get_port_offset host $controller_port)
 210         cd "$OPWD"
 211         controller_port=$(( $controller_port - $controller_offset))
 212         scsi_id="scsi-${controller_port}:${cil}"
 213         if [ "$d" ] ; then
 214                 d="${scsi_id}-$d"
 215         else
 216                 d="$scsi_id"
 217         fi
 218         D="$controller_dev"
 219         RESULT=0
 220 }
 221
 222 handle_firewire () {
 223         :handle_firewire $*
 224         local DEV=$1
 225         if [ -f "$D/ieee1394_id" ] ; then
 226                 read ieee1394_id < $D/ieee1394_id
 227         fi
 228         if [ -z "$ieee1394_id" ] ; then
 229                 : no IEEE1394 ID
 230                 RESULT=1
 231                 return
 232         fi
 233         fw_host_dev=${DEV%/fw-host*}
 234         # IEEE1394 devices are always endpoints
 235         d="ieee1394-0x$ieee1394_id"
 236         D="$fw_host_dev"
 237         RESULT=0
 238 }
 239
 240 handle_fc () {
 241         : handle_fc $*
 242         local DEV=$1
 243         local cil controller_port controller_dev
 244         # SCSI-FC device
 245         fc_tgt_hcil="${DEV##*/}"
 246         fc_tgt_lun="${fc_tgt_hcil##*:}"
 247         fc_tgt_path="${DEV%/*}"
 248         fc_tgt_num="${fc_tgt_path##*/}"
 249         fc_tgt_dev="${fc_tgt_path}/fc_transport:${fc_tgt_num}"
 250         if [ -e "$fc_tgt_dev/port_name" ]; then
 251                 read wwpn < $fc_tgt_dev/port_name
 252         fi
 253         if [ -z "$wwpn" ] ; then
 254                 : no WWPN
 255                 RESULT=1
 256                 return
 257         fi
 258         # Linux currently knows about 32bit luns
 259         tmp_lun3=$(printf "%04x" $(($fc_tgt_lun & 0xFFFF)))
 260         tmp_lun2=$(printf "%04x" $(( ($fc_tgt_lun >> 16) & 0xFFFF)))
 261         tmp_lun1="0000"
 262         tmp_lun0="0000"
 263         if (($fc_tgt_lun == 0)) ; then
 264                 lun="0x0000000000000000"
 265         else
 266                 lun="0x${tmp_lun3}${tmp_lun2}${tmp_lun1}${tmp_lun0}"
 267         fi
 268         controller_dev="${fc_tgt_path%/host[0-9]*}"
 269         # FC devices are always endpoints
 270         d="fc-${wwpn}:${lun}"
 271         D="$controller_dev"
 272         RESULT=0
 273 }
 274
 275 handle_sas () {
 276         : handle_sas $*
 277         local DEV=$1
 278         local cil adapter controller_dev
 279         # SAS device
 280         sas_host_path="${DEV%%/phy*}"
 281         sas_phy_path="${DEV#*/host*/}"
 282         sas_phy_path="${sas_phy_path%%/target*}"
 283         sas_phy_id="${sas_phy_path%%/*}"
 284         sas_rphy_id="${sas_phy_path##*/}"
 285         sas_phy_dev="/sys/class/sas_phy/${sas_phy_id}"
 286         if [ -e "$sas_phy_dev/sas_address" ]; then
 287                 read phy_address < $sas_phy_dev/sas_address
 288                 read phy_port < $sas_phy_dev/port_identifier
 289                 read phy_id < $sas_phy_dev/phy_identifier
 290         fi
 291         if [ -z "$phy_address" ] ; then
 292                 : no initiator address
 293                 RESULT=1
 294                 return
 295         fi
 296         sas_phy_address="$phy_address:$phy_port:$phy_id"
 297         sas_rphy_dev="/sys/class/sas_device/${sas_rphy_id}"
 298         if [ -e "$sas_rphy_dev/sas_address" ]; then
 299                 read rphy_address < $sas_rphy_dev/sas_address
 300                 read rphy_id < $sas_rphy_dev/phy_identifier
 301         fi
 302         if [ -z "$rphy_address" ] ; then
 303                 : no initiator address
 304                 RESULT=1
 305                 return
 306         fi
 307         sas_rphy_address="$rphy_address:$rphy_id"
 308         controller_dev="${sas_host_path%/host[0-9]*}"
 309         # SAS devices are always endpoints
 310         d="sas-${sas_phy_address}-${sas_rphy_address}"
 311         D="$controller_dev"
 312         RESULT=0
 313 }
 314
 315 handle_usb () {
 316 : handle_usb $*
 317         local DEV=$1
 318         cd -P $1
 319         DEV=${PWD}
 320         port_id=${DEV##*/}
 321         port_num=${port_id#*-}
 322         host_dev_path=$DEV
 323         while [ ! -z "$host_dev_path" ] ; do
 324                 case "$host_dev_path" in
 325                         */usb*)
 326                                 usb_host_path=$host_dev_path
 327                                 host_dev_path="${host_dev_path%/*}"
 328                                 ;;
 329                         *)
 330                                 break
 331                                 ;;
 332                 esac
 333         done
 334         : host_dev_path $host_dev_path
 335         usb_host_num=${usb_host_path##*/usb}
 336
 337         cd "$host_dev_path"
 338         usb_host_offset=$(get_port_offset usb $usb_host_num)
 339         usb_host_port=$(($usb_host_num - $usb_host_offset))
 340         cd "$OPWD"
 341         if [ "$d" ] ; then
 342                 d="usb-$usb_host_port:$port_num-${d}"
 343         else
 344                 d="usb-$usb_host_port:$port_num"
 345         fi
 346         D="$host_dev_path"
 347         RESULT=0
 348 }
 349
 350 handle_device () {
 351         full_sysfs_path="$SYSFS$DEVPATH"
 352         if [ -L $full_sysfs_path/subsystem ]; then
 353                 # new sysfs block layout
 354                 full_sysfs_path="${full_sysfs_path%/*}"
 355                 cd "$full_sysfs_path/subsystem";
 356                 subsys="`pwd -P`"
 357                 cd "$OPWD"
 358                 subsys="${subsys##*/}"
 359                 if [ "$subsys" == "block" ]; then
 360                         # parent is "block", it's a partition, move one up
 361                         full_sysfs_path="${full_sysfs_path%/*}"
 362                 fi
 363                 cd $full_sysfs_path
 364         else
 365                 # old sysfs block layout
 366                 if [ ! -L $full_sysfs_path/device ] ; then
 367                         if [ -f $full_sysfs_path/range ] ; then return ; fi
 368                         full_sysfs_path="${full_sysfs_path%/*}"
 369                         : full_sysfs_path "$full_sysfs_path"
 370                         if [ ! -L $full_sysfs_path/device -o ! -f $full_sysfs_path/dev ] ; then
 371                                 return
 372                         fi
 373                 fi
 374                 cd $full_sysfs_path/device
 375         fi
 376         full_sysfs_device_path="`pwd -P`"
 377         cd "$OPWD"
 378         D=$full_sysfs_device_path
 379         while [ ! -z "$D" ] ; do
 380                 case "$D" in
 381                         */ide[0-9]/[0-9].[0-9]*|*/ide[0-9][0-9]/[0-9][0-9].[0-9]*)
 382                                 handle_ide "$D"
 383                                 ;;
 384                         */css0/*)
 385                                 if [ -r $full_sysfs_device_path/wwpn ]; then
 386                                         read wwpn < $full_sysfs_device_path/wwpn
 387                                 fi
 388                                 if [ -r $full_sysfs_device_path/fcp_lun ]; then
 389                                         read lun < $full_sysfs_device_path/fcp_lun
 390                                 fi
 391                                 if [ -r $full_sysfs_device_path/hba_id ]; then
 392                                         read bus_id < $full_sysfs_device_path/hba_id
 393                                 fi
 394                                 if [ "$bus_id" -a "$wwpn" -a "$lun" ]; then
 395                                         # S/390 zfcp adapter
 396                                         d="ccw-$bus_id-zfcp-$wwpn:$lun"
 397                                         RESULT=0
 398                                 else
 399                                         # DASD devices
 400                                         bus="ccw"
 401                                         adapter=${D##*/}
 402                                         d="$bus-$adapter"
 403                                         RESULT=0
 404                                 fi
 405                                 D=
 406                                 ;;
 407                         */rport-[0-9]*:[0-9]*-[0-9]*/*)
 408                                 handle_fc "$D"
 409                                 ;;
 410                         */phy-[0-9]*:[0-9]*/*)
 411                                 handle_sas "$D"
 412                                 ;;
 413                         */fw-host[0-9]*/*)
 414                                 handle_firewire "$D"
 415                                 ;;
 416                         */host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
 417                                 handle_scsi "$D"
 418                                 ;;
 419                         */usb[0-9]*/[0-9]*/*)
 420                                 handle_usb "$D"
 421                                 ;;
 422                         */pci[0-9]*:[0-9]*)
 423                                 handle_pci "$D"
 424                                 ;;
 425                         */serio[0-9]*)
 426                                 handle_serio "$D"
 427                                 ;;
 428                         */platform/*)
 429                                 handle_platform "$D"
 430                                 ;;
 431                         */devices)
 432                                 D=
 433                                 ;;
 434                         *)
 435                                 : not handled
 436                                 RESULT=1
 437                                 return
 438                                 ;;
 439                 esac
 440         done
 441         if [ "$TYPE" == "scsi_tape" ] ; then
 442                 devname=${full_sysfs_path##*/}
 443                 rewind="${devname%%st*}"
 444                 mode="${devname##*st}"
 445                 case "$mode" in
 446                         *l)
 447                                 mode="l"
 448                                 ;;
 449                         *m)
 450                                 mode="m"
 451                                 ;;
 452                         *a)
 453                                 mode="a"
 454                                 ;;
 455                         *)
 456                                 mode=""
 457                            ;;
 458                 esac
 459                 if [ "$d" ]; then
 460                         d="$d-${rewind}st${mode}"
 461                 fi
 462         fi
 463 }
 464
 465 case "$TYPE" in
 466         block)
 467                 handle_device
 468                 echo "ID_PATH=$d"
 469                 ;;
 470         scsi_tape)
 471                 handle_device
 472                 echo "ID_PATH=$d"
 473                 ;;
 474         input)
 475                 handle_device
 476                 echo "ID_PATH=$d"
 477                 ;;
 478         *)
 479                 RESULT=1
 480                 ;;
 481 esac
 482
 483 exit $RESULT