linux-kernel - Re: Adding subroot information to /proc/mounts, or obtaining that through other means

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Message-Id: <1182442837.3342.13.camel@ram.us.ibm.com>
Date:	Thu, 21 Jun 2007 09:20:37 -0700
From:	Ram Pai <linuxram@...ibm.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Al Viro <viro@....linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, util-linux-ng@...r.kernel.org
Subject: Re: Adding subroot information to /proc/mounts, or obtaining that
	through other means

On Wed, 2007-06-20 at 14:20 -0700, H. Peter Anvin wrote:
> Al Viro wrote:
> > On Wed, Jun 20, 2007 at 01:57:33PM -0700, H. Peter Anvin wrote:
> >> ... or, alternatively, add a subfield to the first field (which would
> >> entail escaping whatever separator we choose):
> >>
> >> /dev/md6 /export ext3 rw,data=ordered 0 0
> >> /dev/md6:/users/foo /home/foo ext3 rw,data=ordered 0 0
> >> /dev/md6:/users/bar /home/bar ext3 rw,data=ordered 0 0
> > 
> > Hell, no.  The first field is in principle impossible to parse unless
> > you know the fs type.
> > 
> > How about making a new file with sane format?  From the very
> > beginning.  E.g. mountpoint + ID + relative path + type + options,
> > where ID uniquely identifies superblock (e.g. numeric st_dev)
> > and backing device (if any) is sitting among the options...
> 
> Okay, I see there has been some discussion on this earlier, based on a
> proposal by Ram Pai, so it pretty much comes down to redesigning this
> right.  I see some issues with his proposal (device numbers exported to
> userspace in text form should be separated into major:minor form, for
> one thing.)  I know the util-linux-ng people have also had issues with
> /proc/mounts that they would like resolved in order to finally nuke
> /etc/mtab.
> 
> Is Ram still working on this?  I'd like to help make this happen so we
> can be done with it.

Peter, I am not working on it currently. But i am interested in getting
it done. I have the seed set of patches which had Al Viro's ideas
incorporated. Infact those patches were sent on lkml 2 months back.
Shall we start with those patches?

RP


> 
> 	-hpa
> 
> 

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