linux-kernel - mount --bind and /proc/mounts

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Message-Id: <200701021455.32683.hlawatschek@atix.de>
Date:	Tue, 2 Jan 2007 14:55:32 +0100
From:	Mark Hlawatschek <hlawatschek@...x.de>
To:	linux-kernel@...r.kernel.org
Subject: mount --bind and /proc/mounts

Hi,

I'm using a shared root environment and therefore linked /etc/mtab 
to /proc/mounts. In addition I'm using --bind mount to make administration 
easier.

Now I found the following behaviour:
# mount -a 
is mounting all filesystems with bind options in the fstab 
everytime the command "mount -a " is executed. 

That works fine using an /etc/mtab file, but fails for --bind mounts 
using /etc/mtab linked to /proc/mounts.

I think this is because /etc/mtab has information about the source directory 
and /proc/mounts shows the device, hosting the filesystem.

e.g.
# mount --bind /tmp/bmount/ /mnt/bmount/
# cat /etc/mtab
(...) /tmp/bmount /mnt/bmount none rw,bind 0 0
# cat /proc/mounts
(...) /dev/root /mnt/bmount ext3 rw,data=ordered 0 0

Is there a solution for this ?

Thanks,

Mark

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