[systemd-devel] mount ubifs using /dev/ubi0_X path

[Zbigniew Jędrzejewski-Szmek]

On Thu, Feb 02, 2017 at 02:11:28PM +0100, Lennart Poettering wrote:
> On Mon, 23.01.17 23:02, Mirza Krak (mirza.krak at gmail.com) wrote:
> 
> > 2017-01-23 22:36 GMT+01:00 Mirza Krak <mirza.krak at gmail.com>:
> > > 2017-01-23 18:09 GMT+01:00 Lennart Poettering <lennart at poettering.net>:
> > >> On Mon, 23.01.17 17:56, Mirza Krak (mirza.krak at gmail.com) wrote:
> > >>
> > >>> Simply running "mount -a" once the system has started up gives me no
> > >>> issues and /data is mounted according to my specification in
> > >>> /etc/fstab.
> > >>>
> > >>> Also changing my fstab entry from "/dev/ubi0_2" to "ubi0_2" or
> > >>> "ubi0:data" produces no errors and it is mounted as expected. But I
> > >>> really want to use the "/dev" and I do not see a reason why it should
> > >>> not work?
> > >>
> > >> systemd only picks up devices that carry the "systemd" label in udev,
> > >> and do not have SYSTEMD_READY=0 set. Usually the label is added by
> > >> some udev rule, most likely that's missing for your devices.
> > >>
> > >> See systemd.device(5) for details.
> > >
> > > Thank you Lennart for your fast response.
> > >
> > > Adding
> > >
> > >     SUBSYSTEM=="ubi", TAG+="systemd"
> > >
> > > did indeed solve it.
> > 
> > I just noticed that the file I ended up editing was 99-systemd.rules,
> > which is part of systemd. This was the file that made most sense when
> > I was looking trough all the .rules files I had on my system.
> > 
> > UBI is a common file system that is used on raw FLASH systems, in the
> > embedded world.
> > 
> > Would you consider adding that line in upstream? IMO it fits along
> > side SUBSYSTEM=="block", TAG+="systemd" that is all ready in the file.
> > But I might me "embedded" damaged for requesting this...
> 
> If ubifs is merged in the upstream kernel, then we can certainly add
> the relevant bits to systemd too. Please post a PR for that on github
> and we'll merge it.

There's some confusion here. Ubifs vs. UBI the block device.
UBI is certainly in the kernel [1], please submit a PR to add the TAG.

Zbyszek

[1] https://github.com/torvalds/linux/blob/master/drivers/mtd/ubi/Kconfig