From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [Q] pivot_root and initrd
Date: 17 Oct 2001 14:17:59 -0700 [thread overview]
Message-ID: <9qksi7$sdc$1@cesium.transmeta.com> (raw)
In-Reply-To: <p05100300b7f2b3b94b17@[10.128.7.49]> <3BCDCF1D.6030202@usa.net>
Followup to: <3BCDCF1D.6030202@usa.net>
By author: Eric <ebrower@usa.net>
In newsgroup: linux.dev.kernel
>
> I am mystified that the call to 'exec /sbin/init' works if you are using
> the standard (you mention "based on RedHat7.1" util-linux") /sbin/init
> proggie, and that a standard RH7.1 initscripts would not complain when
> the root filesystem is already mounted r/w.
>
> I would also guess that you are susceptible to the kernel's change_root
> call if your /sbin/init terminates. I'll have to play with the disk a bit.
>
I modify the initscripts to not try to fsck and remount the root --
its a ramfs (tmpfs in a later version) after all. If I had been
mounting a filesystem off the harddisk I would either have mounted it
readonly and left the init scripts as-is, or fscked it before
mounting.
I pass the following command line options to the kernel (this is set
up in isolinux.cfg):
append initrd=initrd.gz root=/dev/ram0 init=/linuxrc single
By specifying root=/dev/ram0 and an explicit init (which I'm calling
/linuxrc but could just as easily have called /sbin/init) I'm telling
the kernel that this is the final root, and effectively turn off most
of the initrd legacy weirdness.
If /sbin/init exits, the kernel panics, just like it would normally do
if init goes away.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
next prev parent reply other threads:[~2001-10-17 21:18 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <p05100300b7f2b3b94b17@[10.128.7.49]>
2001-10-17 18:34 ` [Q] pivot_root and initrd Eric
2001-10-17 21:17 ` H. Peter Anvin [this message]
2001-10-27 12:45 ` Kai Henningsen
2001-11-05 21:52 ` Andreas Schwab
[not found] <p05100304b80cbe9cf127@[10.128.7.49]>
2001-11-06 0:05 ` Eric
[not found] <p05100328b7fb8dcb9473@[207.213.214.37]>
2001-10-23 21:54 ` Eric
2001-10-24 0:20 ` Werner Almesberger
2001-10-23 17:42 Eric
2001-10-23 18:14 ` H. Peter Anvin
2001-10-23 19:54 ` bill davidsen
2001-10-23 19:59 ` Rik van Riel
2001-10-23 20:21 ` bill davidsen
2001-10-23 21:00 ` H. Peter Anvin
2001-10-23 20:37 ` Werner Almesberger
2001-10-23 20:46 ` Richard B. Johnson
2001-10-23 20:52 ` H. Peter Anvin
2001-10-23 21:05 ` Richard B. Johnson
2001-10-23 21:06 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2001-10-17 2:16 Eric
2001-10-17 3:30 ` H. Peter Anvin
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