[systemd-devel] [PATCH 1/2] core: keep mountinfo .mounts until late shutdown

[Zbigniew Jędrzejewski-Szmek]

On Mon, Feb 04, 2013 at 05:27:24PM +0100, Umut Tezduyar wrote:
> Hi
> 
> On Mon, Feb 4, 2013 at 4:23 PM, Zbigniew Jędrzejewski-Szmek <
> zbyszek at in.waw.pl> wrote:
> 
> > Hi,
> >
> > On Mon, Feb 04, 2013 at 03:03:59PM +0100, Umut Tezduyar wrote:
> > > Downside of this patch is, mountinfo mounts stick around as inactive-dead
> > > even when the file system they represent is unmounted.
> > >
> > >
> > > On Mon, Feb 4, 2013 at 3:00 PM, Umut Tezduyar <umut at tezduyar.com> wrote:
> > >
> > > > .mount units coming from /proc/self/mountinfo file are
> > > > unmounted after local-fs.target is reached during shutdown.
> > > >
> > > > Problem: .mount units popping up in mountinfo file are
> > > > added to systemd without any dependency. For that reason,
> > Hm, what do you mean exactly by that? Mount units I see have dependencies
> > on mount points higher in the hierarchy. E.g.
> > Requires=systemd-journald.socket -.mount home.mount
> > After=systemd-journald.socket -.mount home.mount
> > Description=/home/zbyszek/debian-x32/home
> > SourcePath=/proc/self/mountinfo
> >
> 
> Mount units have dependencies on higher mount points but they do not have
> default dependencies like local-fs-pre.target, local-fs.target,
> umount.target. You can compare a mount unit coming from /etc/fstab with one
> /proc/self/mountinfo.
Hi,

I think that an addition of relationships with other units is necessary.
But adding RequiredBy=local-fs.target,Before=local-fs.target doesn't
seem to be the right combination.

Before=local-fs.target -> OK.
RequiredBy=local-fs.target -> This one doesn't seem to be necessary. In
   practice there's little difference since alread-mounted mounts can't
   "fail", but it's better to keep the dependency graph sparse.
Conflicts=umount.target -> I think that we want this one. Without this,
   mounts added by hand will be left till the very end, but there's
   no reason to make them special like this.

Zbyszek