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Date: Wed, 11 Feb 2004 07:50:49 +0000
From: viro@parcelfarce.linux.theplanet.co.uk
To: Greg KH <greg@kroah.com>
Cc: "Bill Rugolsky Jr." <brugolsky@telemetry-investments.com>,
       linux-kernel@vger.kernel.org
Subject: Re: devfs vs udev, thoughts from a devfs user
Message-ID: <20040211075049.GJ21151@parcelfarce.linux.theplanet.co.uk>
References: <20040210113417.GD4421@tinyvaio.nome.ca> <20040210170157.GA27421@kroah.com> <20040210171337.GK4421@tinyvaio.nome.ca> <40291A73.7050503@nortelnetworks.com> <20040210192456.GB4814@tinyvaio.nome.ca> <40293508.1040803@nortelnetworks.com> <40293AF8.1080603@backtobasicsmgmt.com> <20040210203900.GA18263@ti19.telemetry-investments.com> <20040211011559.GA2153@kroah.com>
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On Tue, Feb 10, 2004 at 05:16:00PM -0800, Greg KH wrote:
> On Tue, Feb 10, 2004 at 03:39:00PM -0500, Bill Rugolsky Jr. wrote:
> > On Tue, Feb 10, 2004 at 01:11:36PM -0700, Kevin P. Fleming wrote:
> > > devfs is "single-instance": it can be mounted during initrd/initramfs 
> > > processing, then remounted after pivot_root without losing its contents
> > > 
> > > Granted, I'm sure someone can come up with a single-instance ramfs 
> > > filesystem that can be used for udev, but today it does not exist.
> >  
> > mount --move olddir newdir
> 
> Doesn't work for what we want here:
> 
> 	$ mkdir /tmp/a /tmp/b
> 	$ mount -t ramfs none /tmp/a
> 	$ touch /tmp/a/foo
> 	$ mount --move /tmp/a /tmp/b
> 	$ ls /tmp/b
> 	foo
> 	$ umount /tmp/a
> 	$ ls /tmp/b
> 	$ 
> 
> Hm, not nice :(

Huh?  Is that a bug report or just your guess at what would happen if you
tried the above?

If it _does_ happen - we have a problem and I'd like to know which versions
have such bug.