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

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Message-ID: <20070620222437.GY7226@petra.dvoda.cz>
Date:	Thu, 21 Jun 2007 00:24:37 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Al Viro <viro@....linux.org.uk>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	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, Jun 20, 2007 at 10:03:43PM +0100, 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...

 Yeah. How about include propagation trees to this file?

 mountpoint + ID + relative path + type + options + propagation-flag +
 {peer,master}-mount-id

 / 0xa917800 / ext3 rw PRIVATE
 /mnt 0xa917100 / ext3 rw SHARED peer:0xa917100
 /tmp 0xa917f00 /1 ext3 rw SLAVE master:0xa917100



    Karel


-- 
 Karel Zak  <kzak@...hat.com>
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