linux-kernel - Re: [patch 02/10] Dont touch fs

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Date:	Thu, 27 Sep 2007 22:39:22 +0200
From:	Christoph Hellwig <hch@....de>
To:	Greg KH <greg@...ah.com>
Cc:	jblunck@...e.de, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, hch@....de, agruen@...e.de, tiwai@...e.de
Subject: Re: [patch 02/10] Dont touch fs_struct in usermodehelper

On Thu, Sep 27, 2007 at 10:46:04AM -0700, Greg KH wrote:
> On Thu, Sep 27, 2007 at 04:12:02PM +0200, jblunck@...e.de wrote:
> > This test seems to be unnecessary since we always have rootfs mounted before
> > calling a usermodehelper.
> 
> Are you sure this is true?  I thought we called the usermode helper for
> hotplug _very_ early in the boot sequence when the device tree starts to
> get populated.

rootfs is mounted by init_mount_tree, and curret->fs is set up for init
there aswell.  This is called by mnt_init, which is called by
vfs_caches_init, which is called by start_kernel far before we go to
rest_init which finally creates a thread to call kernel_init which then
calls do_basic_setup which calls do_initcalls to initialize drivers and
afterwards runs the initrd/initramfs.

While the actual function names in main.c changed quite a bit we've
initialized the initial namespace very early on since the 2.5 days.
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