[systemd-devel] udev virtio by-path naming

[Viktor Mihajlovski]

On 01.03.2017 19:44, Daniel P. Berrange wrote:
[...]
replying on the list, a bit lengthy
> 
> Ok, my guest has 4 disks
> 
>  - sda - virtio-scsi, over virtio-pci transport
>  - sdb - virtio-scsi, over virtio-mmio transport
>  - vda - virtio-scsi, over virtio-pci transport
>  - vdb - virtio-scsi, over virtio-mmio transport
> 
> with systemd 231 I get these links
> 
>   platform-3f000000.pcie-pci-0000:00:01.1-virtio-pci-0000:02:00.0-scsi-0:0:0:0 -> ../../sda
>   platform-3f000000.pcie-pci-0000:00:01.3-virtio-pci-0000:04:00.0 -> ../../vda
this is somewhat suprising (the pcie-pci-xxxx part), could you once more
do me a favor and run
 udevadm info -a /dev/vda
and paste the output?
>   virtio-pci-a003c00.virtio_mmio -> ../../vdb
>   virtio-pci-a003e00.virtio_mmio-scsi-0:0:0:0 -> ../../sdb
> 
> after applying your patch I get these links:
> 
>  platform-3f000000.pcie-pci-0000:00:01.1-virtio-pci-0000:02:00.0-scsi-0:0:0:0 -> ../../sda
>  platform-3f000000.pcie-pci-0000:00:01.3-virtio-pci-0000:04:00.0 -> ../../vda
well, these are probably stale links from the old systemd baked into
your initrd
>  platform-3f000000.pcie-pci-0000:02:00.0-scsi-0:0:0:0 -> ../../sda
>  platform-3f000000.pcie-pci-0000:04:00.0 -> ../../vda
I don't yet understand these, especially why the intermediate pci-xxxx
id has vanished
>  platform-a003c00.virtio_mmio -> ../../vdb
>  platform-a003e00.virtio_mmio-scsi-0:0:0:0 -> ../../sdb
these look as expected
>  virtio-pci-a003c00.virtio_mmio -> ../../vdb
>  virtio-pci-a003e00.virtio_mmio-scsi-0:0:0:0 -> ../../sdb
stale
> 
> So that appears to be working as designed - the 4 backcompat symlinks are
> still there, and the new symlinks all live under the platform- prefix
> and don't have a bogus 'pci' in the name for mmio links
the patch only provide compat symlinks for the pci path ids
traditionally seen on x86 systems, but I think we don't want those for
platforms other than x86, right?
> 
> Regards,
> Daniel
> 


-- 

Mit freundlichen Grüßen/Kind Regards
   Viktor Mihajlovski

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