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Date: Thu, 28 Jun 2007 11:36:16 -0400
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Pavel Machek <pavel@ucw.cz>
CC: Al Viro <viro@ftp.linux.org.uk>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-fsdevel@vger.kernel.org, util-linux-ng@vger.kernel.org
Subject: Re: Adding subroot information to /proc/mounts, or obtaining that
 through other means
References: <467994BD.6000403@zytor.com> <20070620210343.GQ21478@ftp.linux.org.uk> <20070628145308.GD5339@ucw.cz>
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Pavel Machek wrote:
> Hi!
> 
>>> ... 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
> 
> Well, what about /sysfs, with its one value per file rule?
> 

There are two reasons not to do it that way:

- atomicity
- backwards compatibility

Of these, I would argue the former is the most important.

Additionally, I don't think sysfs has the ability to present different 
structures on a per-process basis; keep in mind this isn't really 
/proc/mounts, but really /proc/<pid>/mounts.

	-hpa
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