From: Rob Landley <rob@landley.net>
To: Linda Walsh <lkml@tlinx.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: new mount is broken w/regard to devnames in /etc/fstab
Date: Mon, 20 May 2013 14:39:18 -0500 [thread overview]
Message-ID: <1369078758.2776.2@driftwood> (raw)
In-Reply-To: <51985C9E.3020106@tlinx.org> (from lkml@tlinx.org on Sun May 19 00:01:18 2013)
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
next prev parent reply other threads:[~2013-05-20 19:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-19 5:01 new mount is broken w/regard to devnames in /etc/fstab Linda Walsh
2013-05-20 19:39 ` Rob Landley [this message]
2013-05-20 20:52 ` Linda Walsh
2013-05-22 0:39 ` Rob Landley
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