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

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Message-ID: <4679A53B.9090103@zytor.com>
Date:	Wed, 20 Jun 2007 15:07:55 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Karel Zak <kzak@...hat.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

Karel Zak wrote:
> 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".
> 

Out of curiosity, and trying to better grok the problem, what would
mount(8) do differently with the second format versus the first?

	-hpa
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