[Bug 1321816] [NEW] udev uses wrong/conflicting /dev/disk/by-path link for scsi disks

[Phillip Susi]

Public bug reported:

The /dev/disk/by-path links to scsi disks are supposed to be of the form
"scsi-$host:$bus:$device$lun".  The host portion is always zero, leading
to duplicates from different hosts.  It appears these numbers are pulled
from ID_PATH, and I can't figure out where this variable comes from.

I noticed this while playing around with the lio fake scsi target
adapter.  Here is the full udev info on a disk created on such an
adapter.  As you can see, it has been assigned scsi host id 13, so that
is what it should be using for the $host digit, rather than zero.

P: /devices/tcm_loop_0/tcm_loop_adapter_5/host13/target13:0:1/13:0:1:0/block/sdg
N: sdg
S: disk/by-path/scsi-0:0:1:0
E: DEVLINKS=/dev/disk/by-path/scsi-0:0:1:0
E: DEVNAME=/dev/sdg
E: DEVPATH=/devices/tcm_loop_0/tcm_loop_adapter_5/host13/target13:0:1/13:0:1:0/block/sdg
E: DEVTYPE=disk
E: ID_BUS=scsi
E: ID_MODEL=FILEIO
E: ID_MODEL_ENC=FILEIO\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
E: ID_PART_TABLE_TYPE=dos
E: ID_PATH=scsi-0:0:1:0
E: ID_PATH_TAG=scsi-0_0_1_0
E: ID_REVISION=4.0
E: ID_SCSI=1
E: ID_TYPE=disk
E: ID_VENDOR=LIO-ORG
E: ID_VENDOR_ENC=LIO-ORG\x20
E: MAJOR=8
E: MINOR=96
E: SUBSYSTEM=block
E: USEC_INITIALIZED=400656927711
E: nomdmonddf=1
E: nomdmonisw=1

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1321816

Title:
  udev uses wrong/conflicting /dev/disk/by-path link for scsi disks

Status in “systemd” package in Ubuntu:
  New

Bug description:
  The /dev/disk/by-path links to scsi disks are supposed to be of the
  form "scsi-$host:$bus:$device$lun".  The host portion is always zero,
  leading to duplicates from different hosts.  It appears these numbers
  are pulled from ID_PATH, and I can't figure out where this variable
  comes from.

  I noticed this while playing around with the lio fake scsi target
  adapter.  Here is the full udev info on a disk created on such an
  adapter.  As you can see, it has been assigned scsi host id 13, so
  that is what it should be using for the $host digit, rather than zero.

  P: /devices/tcm_loop_0/tcm_loop_adapter_5/host13/target13:0:1/13:0:1:0/block/sdg
  N: sdg
  S: disk/by-path/scsi-0:0:1:0
  E: DEVLINKS=/dev/disk/by-path/scsi-0:0:1:0
  E: DEVNAME=/dev/sdg
  E: DEVPATH=/devices/tcm_loop_0/tcm_loop_adapter_5/host13/target13:0:1/13:0:1:0/block/sdg
  E: DEVTYPE=disk
  E: ID_BUS=scsi
  E: ID_MODEL=FILEIO
  E: ID_MODEL_ENC=FILEIO\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
  E: ID_PART_TABLE_TYPE=dos
  E: ID_PATH=scsi-0:0:1:0
  E: ID_PATH_TAG=scsi-0_0_1_0
  E: ID_REVISION=4.0
  E: ID_SCSI=1
  E: ID_TYPE=disk
  E: ID_VENDOR=LIO-ORG
  E: ID_VENDOR_ENC=LIO-ORG\x20
  E: MAJOR=8
  E: MINOR=96
  E: SUBSYSTEM=block
  E: USEC_INITIALIZED=400656927711
  E: nomdmonddf=1
  E: nomdmonisw=1

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