linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Date:	Thu, 16 Apr 2015 14:43:10 +0200
From:	Harald Hoyer <harald.hoyer@...il.com>
To:	Olaf Hering <olaf@...fle.de>, Tom Gundersen <teg@...m.no>
CC:	Jiri Kosina <jkosina@...e.cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

Am 16.04.2015 um 14:15 schrieb Olaf Hering:
> On Thu, Apr 16, Tom Gundersen wrote:
> 
>> to a shutdown PID 1 process and finally a transition back to
>> the initial ramdisk so that we can unmount the root file system even.
> 
> Is that wishful thinking or actually implemented somewhere?

This is done on any system, which uses dracut and systemd for a long time now.

As SUSE switched to dracut recently, it should be the same as on RHEL-7/Fedora
now.

If /run/initramfs/shutdown exists and is executable,
/usr/lib/systemd/systemd-shutdown switches root to /run/initramfs/ and executes
shutdown.

The shutdown script umounts the old real root (after umounting
/oldroot/{proc,sys,run,dev}), then if the old real root was living on an
assembled device, like mdraid, the device is disassembled and waited for the
device to be clean.

See
http://git.kernel.org/cgit/boot/dracut/dracut.git/tree/modules.d/99shutdown/shutdown.sh
and for example for mdraid:
http://git.kernel.org/cgit/boot/dracut/dracut.git/tree/modules.d/90mdraid/md-shutdown.sh

This solved quite a lot of problems for unsynced raids.
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