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                 D=
 256                 RESULT=1
 257                 return
 258         fi
 259         # Linux currently knows about 32bit luns
 260         tmp_lun3=$(printf "%04x" $(($fc_tgt_lun & 0xFFFF)))
 261         tmp_lun2=$(printf "%04x" $(( ($fc_tgt_lun >> 16) & 0xFFFF)))
 262         tmp_lun1="0000"
 263         tmp_lun0="0000"
 264         if (($fc_tgt_lun == 0)) ; then
 265                 lun="0x0000000000000000"
 266         else
 267                 lun="0x${tmp_lun3}${tmp_lun2}${tmp_lun1}${tmp_lun0}"
 268         fi
 269         controller_dev="${fc_tgt_path%/host[0-9]*}"
 270         # FC devices are always endpoints
 271         d="fc-${wwpn}:${lun}"
 272         D="$controller_dev"
 273         RESULT=0
 274 }
 275
 276 handle_sas () {
 277         : handle_sas $*
 278         local DEV=$1
 279         local cil adapter controller_dev
 280         # SAS device
 281         sas_host_path="${DEV%%/phy*}"
 282         sas_phy_path="${DEV#*/host*/}"
 283         sas_phy_path="${sas_phy_path%%/target*}"
 284         sas_phy_id="${sas_phy_path%%/*}"
 285         sas_rphy_id="${sas_phy_path##*/}"
 286         sas_phy_dev="/sys/class/sas_phy/${sas_phy_id}"
 287         if [ -e "$sas_phy_dev/sas_address" ]; then
 288                 read phy_address < $sas_phy_dev/sas_address
 289                 read phy_port < $sas_phy_dev/port_identifier
 290                 read phy_id < $sas_phy_dev/phy_identifier
 291         fi
 292         if [ -z "$phy_address" ] ; then
 293                 : no initiator address
 294                 D=
 295                 RESULT=1
 296                 return
 297         fi
 298         sas_phy_address="$phy_address:$phy_port:$phy_id"
 299         sas_rphy_dev="/sys/class/sas_device/${sas_rphy_id}"
 300         if [ -e "$sas_rphy_dev/sas_address" ]; then
 301                 read rphy_address < $sas_rphy_dev/sas_address
 302                 read rphy_id < $sas_rphy_dev/phy_identifier
 303         fi
 304         if [ -z "$rphy_address" ] ; then
 305                 : no initiator address
 306                 D=
 307                 RESULT=1
 308                 return
 309         fi
 310         sas_rphy_address="$rphy_address:$rphy_id"
 311         controller_dev="${sas_host_path%/host[0-9]*}"
 312         # SAS devices are always endpoints
 313         d="sas-${sas_phy_address}-${sas_rphy_address}"
 314         D="$controller_dev"
 315         RESULT=0
 316 }
 317
 318 handle_iscsi() {
 319         local DEV=$1
 320         local iscsi_session_dir
 321         local iscsi_session iscsi_session_path
 322         local iscsi_connection iscsi_connection_path
 323         # iSCSI device
 324         iscsi_session_dir="${DEV%%/target*}"
 325         iscsi_session="${iscsi_session_dir##*/}"
 326         iscsi_session_path=/sys/class/iscsi_session/${iscsi_session}
 327         if [ ! -d "$iscsi_session_path" ] ; then
 328             : no iSCSI session path
 329             RESULT=1
 330             return
 331         fi
 332         # Currently we're not doing MC/S
 333         for conn in ${iscsi_session_dir}/connection* ; do
 334             iscsi_conn_num=${conn##*:}
 335             if [ "$iscsi_conn_num" = '0' ] ; then
 336                 iscsi_connection=$(basename $conn)
 337             fi
 338         done
 339         if [ -z "$iscsi_connection" ] ; then
 340             : no iSCSI connection found
 341             RESULT=1
 342             return
 343         fi
 344         iscsi_connection_path=/sys/class/iscsi_connection/${iscsi_connection}
 345         if [ ! -d "$iscsi_connection_path" ] ; then
 346             : no iSCSI connection path
 347             RESULT=1
 348             return
 349         fi
 350         if [ -e "${iscsi_session_path}/targetname" ]; then
 351             read iscsi_tgtname < ${iscsi_session_path}/targetname
 352         fi
 353         if [ -z "$iscsi_tgtname" ] ; then
 354             : No iSCSI Targetname
 355             RESULT=1
 356             return
 357         fi
 358         if [ -e "${iscsi_connection_path}/persistent_address" ] ; then
 359             read iscsi_address < ${iscsi_connection_path}/persistent_address
 360         fi
 361         if [ -z "$iscsi_address" ] ; then
 362             : No iSCSI Target address
 363             RESULT=1
 364             return
 365         fi
 366         if [ -e "${iscsi_connection_path}/persistent_port" ] ; then
 367             read iscsi_port < ${iscsi_connection_path}/persistent_port
 368         fi
 369         d="ip-${iscsi_address}:${iscsi_port}-iscsi-${iscsi_tgtname}"
 370         RESULT=0
 371 }
 372
 373 handle_usb () {
 374 : handle_usb $*
 375         local DEV=$1
 376         cd -P $1
 377         DEV=${PWD}
 378         port_id=${DEV##*/}
 379         port_num=${port_id#*-}
 380         host_dev_path=$DEV
 381         while [ ! -z "$host_dev_path" ] ; do
 382                 case "$host_dev_path" in
 383                         */usb*)
 384                                 usb_host_path=$host_dev_path
 385                                 host_dev_path="${host_dev_path%/*}"
 386                                 ;;
 387                         *)
 388                                 break
 389                                 ;;
 390                 esac
 391         done
 392         : host_dev_path $host_dev_path
 393         usb_host_num=${usb_host_path##*/usb}
 394
 395         cd "$host_dev_path"
 396         usb_host_offset=$(get_port_offset usb $usb_host_num)
 397         usb_host_port=$(($usb_host_num - $usb_host_offset))
 398         cd "$OPWD"
 399         if [ "$d" ] ; then
 400                 d="usb-$usb_host_port:$port_num-${d}"
 401         else
 402                 d="usb-$usb_host_port:$port_num"
 403         fi
 404         D="$host_dev_path"
 405         RESULT=0
 406 }
 407
 408 handle_device () {
 409         full_sysfs_path="$SYSFS$DEVPATH"
 410         if [ -L $full_sysfs_path/subsystem ]; then
 411                 # new sysfs block layout
 412                 full_sysfs_path="${full_sysfs_path%/*}"
 413                 cd "$full_sysfs_path/subsystem";
 414                 subsys="`pwd -P`"
 415                 cd "$OPWD"
 416                 subsys="${subsys##*/}"
 417                 if [ "$subsys" = "block" ]; then
 418                         # parent is "block", it's a partition, move one up
 419                         full_sysfs_path="${full_sysfs_path%/*}"
 420                 fi
 421                 cd $full_sysfs_path
 422         else
 423                 # old sysfs block layout
 424                 if [ ! -L $full_sysfs_path/device ] ; then
 425                         if [ -f $full_sysfs_path/range ] ; then return ; fi
 426                         full_sysfs_path="${full_sysfs_path%/*}"
 427                         : full_sysfs_path "$full_sysfs_path"
 428                         if [ ! -L $full_sysfs_path/device -o ! -f $full_sysfs_path/dev ] ; then
 429                                 return
 430                         fi
 431                 fi
 432                 cd $full_sysfs_path/device
 433         fi
 434         full_sysfs_device_path="`pwd -P`"
 435         cd "$OPWD"
 436         D=$full_sysfs_device_path
 437         while [ ! -z "$D" ] ; do
 438                 case "$D" in
 439                         */ide[0-9]/[0-9].[0-9]*|*/ide[0-9][0-9]/[0-9][0-9].[0-9]*)
 440                                 handle_ide "$D"
 441                                 ;;
 442                         */css0/*)
 443                                 if [ -r $full_sysfs_device_path/wwpn ]; then
 444                                         read wwpn < $full_sysfs_device_path/wwpn
 445                                 fi
 446                                 if [ -r $full_sysfs_device_path/fcp_lun ]; then
 447                                         read lun < $full_sysfs_device_path/fcp_lun
 448                                 fi
 449                                 if [ -r $full_sysfs_device_path/hba_id ]; then
 450                                         read bus_id < $full_sysfs_device_path/hba_id
 451                                 fi
 452                                 if [ "$bus_id" -a "$wwpn" -a "$lun" ]; then
 453                                         # S/390 zfcp adapter
 454                                         d="ccw-$bus_id-zfcp-$wwpn:$lun"
 455                                         RESULT=0
 456                                 else
 457                                         # DASD devices
 458                                         bus="ccw"
 459                                         adapter=${D##*/}
 460                                         d="$bus-$adapter"
 461                                         RESULT=0
 462                                 fi
 463                                 D=
 464                                 ;;
 465                         */rport-[0-9]*:[0-9]*-[0-9]*/*)
 466                                 handle_fc "$D"
 467                                 ;;
 468                         */phy-[0-9]*:[0-9]*/*)
 469                                 handle_sas "$D"
 470                                 ;;
 471                         */fw-host[0-9]*/*)
 472                                 handle_firewire "$D"
 473                                 ;;
 474                         */session[0-9]*/*)
 475                                 handle_iscsi "$D"
 476                                 D=
 477                                 ;;
 478                         */host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
 479                                 handle_scsi "$D"
 480                                 ;;
 481                         */usb[0-9]*/[0-9]*/*)
 482                                 handle_usb "$D"
 483                                 ;;
 484                         */pci[0-9]*:[0-9]*)
 485                                 handle_pci "$D"
 486                                 ;;
 487                         */serio[0-9]*)
 488                                 handle_serio "$D"
 489                                 ;;
 490                         */platform/*)
 491                                 handle_platform "$D"
 492                                 ;;
 493                         */devices)
 494                                 D=
 495                                 ;;
 496                         *)
 497                                 : not handled
 498                                 RESULT=1
 499                                 return
 500                                 ;;
 501                 esac
 502         done
 503         if [ "$TYPE" = "scsi_tape" ] ; then
 504                 devname=${full_sysfs_path##*/}
 505                 rewind="${devname%%st*}"
 506                 mode="${devname##*st}"
 507                 case "$mode" in
 508                         *l)
 509                                 mode="l"
 510                                 ;;
 511                         *m)
 512                                 mode="m"
 513                                 ;;
 514                         *a)
 515                                 mode="a"
 516                                 ;;
 517                         *)
 518                                 mode=""
 519                            ;;
 520                 esac
 521                 if [ "$d" ]; then
 522                         d="$d-${rewind}st${mode}"
 523                 fi
 524         fi
 525 }
 526
 527 case "$TYPE" in
 528         block)
 529                 handle_device
 530                 echo "ID_PATH=$d"
 531                 ;;
 532         scsi_tape)
 533                 handle_device
 534                 echo "ID_PATH=$d"
 535                 ;;
 536         input)
 537                 handle_device
 538                 echo "ID_PATH=$d"
 539                 ;;
 540         *)
 541                 RESULT=1
 542                 ;;
 543 esac
 544
 545 exit $RESULT