Re: [Xen-devel] [PATCH v1] tools/hotplug: convert proc-xen.mount to proc-xen.service

[Olaf Hering <olaf@xxxxxxxxx>]

On Thu, Oct 26, Andrew Cooper wrote:

> I've never really understood why xenfs exists in the first place
> (although I expect the answer is "Because that is how someone did it in
> the past"), and I'm not aware of any other project which needs its own
> custom filesystem driver for device nodes.

Perhaps in the early days, before udev, new nodes would not magically
appear in /dev. It was likely easy to be compatible that way, just like
claiming /dev/hda to please existing installation programs.

> Is it possible to express a dependency on proc-xen.mount ||
> proc-xen.service?

As ordering yes, an additional After=proc-xen.service line is needed.
An existing Requires=proc-xen.mount can not be used anymore, I have not
verified that.

> If not, then out-of-tree packages are going to have compatibility
> problems with this change.

Only if they use Requires=proc-xen.mount.

> Right, but ISTR that Systemd deals with /etc/fstab by auto-generating
> *.mount targets, and from what is said here, it is the proc-xen.mount
> target which is now broken by the change in systemd behaviour.

No, existing fstab entries will continue to work. /dev/shm is
automounted, and my own fstab entry for /dev/shm always worked.

Olaf

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