[Bug 1623003] Re: udev-generated /dev/disk/by-path names broken for virtio disks

[Dimitri John Ledkov]

Userspace rpm: udev
... Ubuntu does not use RPMs, do you mean .deb or just package?

Note the bugs are tracked by source package name, which is systemd.

This change was introduced upstream in v229 see:
https://github.com/systemd/systemd/blob/master/NEWS

https://github.com/systemd/systemd/commit/f073b1b3c0f4f0df1b0bd61042ce85fb5d27d407

https://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030328.html

https://github.com/systemd/systemd/issues/2501

Please discuss this upstream to change/improve the path_id detection.
This is not ubuntu-specific and affects all Linux on z that use systemd
v229 or newer.

If a fix for this lands upstream, we can discuss cherrypicking it to
xenial.

** Bug watch added: github.com/systemd/systemd/issues #2501
   https://github.com/systemd/systemd/issues/2501

** Changed in: udev (Ubuntu)
       Status: New => Invalid

** Package changed: udev (Ubuntu) => systemd (Ubuntu)

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/2501
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1623003

Title:
  udev-generated /dev/disk/by-path names broken for virtio disks

Status in systemd:
  Unknown
Status in Ubuntu on IBM z Systems:
  New
Status in systemd package in Ubuntu:
  Invalid

Bug description:
  The udev-generated /dev/disk/by-path names for virtio disks are broken on z Systems as they have the format virtio-pci-h.h.hhhh[-partn], where h.h.hhhh is the CCW devno of the virtio device representing the whole disk. Historically, the standard CCW naming was applied, which was ccw-h.h.hhhh[-partn]
   
  ---uname output---
  Linux ubuntu 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:05:09 UTC 2016 s390x s390x s390x GNU/Linux
   
  Machine Type = 2964-703 running KVM for IBM z Systems 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
  1. Install Ubuntu LTS 16.04.1 on KVM for IBM z Systems 1.1.1
  2. Issue ls -l /dev/disk/by-path
   
  Userspace tool common name: udev 
   
  The userspace tool has the following bit modes: 64-bit 

  Userspace rpm: udev

  Userspace tool obtained from project website:  na

  There are basically two problems with this:
  1. The naming is technically incorrect, since the virtio devices on z are no PCI devices but CCW devices
  2. Then naming based on virtio- is backwards incompatible. This may seem not to be an issue for Xenial but customers may be confused if they have been running Linux on KVM for IBM z before.

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