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

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Message-ID: <20070620220551.GX7226@petra.dvoda.cz>
Date:	Thu, 21 Jun 2007 00:05:51 +0200
From:	Karel Zak <kzak@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	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 01:57:33PM -0700, H. Peter Anvin wrote:
> 
> We could add a field to /proc/mounts to add this information:
> 
> /dev/md6 /export ext3 rw,data=ordered 0 0 /
> /dev/md6 /home/foo ext3 rw,data=ordered 0 0 /users/foo
> /dev/md6 /home/bar ext3 rw,data=ordered 0 0 /users/bar

 I prefer this format. It's compatible with the mount(8) -- the mount
 ignores extra columns.

> ... 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

 We needn't a new separator (':') there already is one (' ').

> I'm personally leaning toward the second option (/dev/md6:/users/foo).
> Although that might confuse current utilities, those utilities are
> *already* liable to get confused by the fact that the line doesn't mean
> what they think it means.

 Many people use "ln -s /proc/mounts /etc/mtab".

    Karel

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