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

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Message-ID: <4679AB39.4010909@oracle.com>
Date:	Wed, 20 Jun 2007 18:33:29 -0400
From:	Chuck Lever <chuck.lever@...cle.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

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...

To support NFS client performance statistics, I recently added 
/proc/self/mountstats.  That might be a place to add details about 
--move and --bind mounts without changing the format of /proc/mounts.

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