linux-kernel - Re: new mount is broken w/regard to devnames in /etc/fstab

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Date:	Mon, 20 May 2013 14:39:18 -0500
From:	Rob Landley <rob@...dley.net>
To:	Linda Walsh <lkml@...nx.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: new mount is broken w/regard to devnames in /etc/fstab

On 05/19/2013 12:01:18 AM, Linda Walsh wrote:
> 1) How is one supposed to get the real root device?
> It's not /dev/root -- and on my system /dev/root doesn't even exist.

There was a thread on this a couple months ago:
   https://lkml.org/lkml/2013/3/20/315

You can get the major/minor of a filesystem with the stat() system  
call, or even the stat command line utility. That gives you the  
major/minor of the device the filesystem was mounted from.

Note that there's only a major/minor when the filesystem _has_ a  
backing block device. If it's initramfs or tmpfs: there isn't one. If  
it's nfs, smbfs, or v9fs: there isn't one.

Rob--
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