[systemd-devel] /run needs to be mounted? ugh.

[Andrey Borzenkov]

В Tue, 11 Feb 2014 17:20:15 +0100
"Jason A. Donenfeld" <Jason at zx2c4.com> пишет:

> On Tue, Feb 11, 2014 at 5:15 PM, Dave Reisner <d at falconindy.com> wrote:
> > I don't think there's any change needed here. The interface states:
> >
> >   "The initrd should mount /run as a tmpfs".
> 
> > And sure enough, this isn't a requirement, but there's many valid
> > reasons to do this.
> 
> 
> Ahh, okay. I suppose what I'm wondering is what the advantages are to
> mounting /run (if the remaining interfaces in the list aren't used)?
> It looks like mounting /run occurs pretty soon in core/main.c. Could
> it be that the only advantages of mounting /run early on are for using
> the more advanced systemd initrd interfaces, such as giving control
> back during shutdown? Or are there benefits in doing this even for the
> most minimal of initrd?

/run is used to pass state between initrd and system for such
components as udev or mdadm. I do not know how your initramfs
implementation works and whether it is using udev, but if you support
root on MD, you likely will need /run.