linux-kernel - Re: 2.6.28-rc3: kernel mounts the same device twice? Or /proc/mounts lies?

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Message-ID: <20081105090522.GB3570@x200.localdomain>
Date:	Wed, 5 Nov 2008 12:05:22 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc3: kernel mounts the same device twice? Or
	/proc/mounts lies?

On Tue, Nov 04, 2008 at 12:13:07PM +0300, Andrey Borzenkov wrote:
> Out of some infinite wisdom something on my system decided to add
> fstab entry for "new" device after switching from IDE to PATA:
> 
> # Entry for /dev/LABEL=/ :
> LABEL=/ / reiserfs relatime,tail 1 1
> none /proc proc defaults 0 0
> none /sys sysfs defaults 0 0
> none /tmp tmpfs defaults 0 0
> # Entry for /dev/LABEL=swap :
> LABEL=swap swap swap defaults 0 0
> # Entry for /dev/sda2 :
> UUID=72973377-c299-4ca6-ae94-2022b7dca58f /media/hd reiserfs defaults 0 0
> 
> Note that both / and /media/hd refer to the same device:
> 
> {pts/0}% sudo blkid
> /dev/sda1: TYPE="swap" LABEL="swap" UUID="3b4dc82c-a6e6-4609-be9e-16d9206ab7fd"
> /dev/sda2: UUID="72973377-c299-4ca6-ae94-2022b7dca58f" LABEL="/" TYPE="reiserfs"
> 
> And according to /proc/mounts both are mounted at the same time:
> 
> {pts/0}% cat /proc/mounts
> rootfs / rootfs rw 0 0
> /dev/root / reiserfs rw 0 0
> /dev /dev tmpfs rw 0 0
> /proc /proc proc rw 0 0
> /sys /sys sysfs rw 0 0
> /proc/bus/usb /proc/bus/usb usbfs rw,devgid=43,devmode=664 0 0
> none /dev/pts devpts rw,mode=620 0 0
> none /dev/shm tmpfs rw 0 0
> none /tmp tmpfs rw 0 0
> none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
> /dev/sda2 /media/hd reiserfs rw 0 0
> {pts/0}% ll /dev/root
> brw------- 1 root root 8, 2 2008-11-04 12:01 /dev/root
> {pts/0}% ll /dev/sda2
> brw-rw---- 1 root disk 8, 2 2008-11-04 12:01 /dev/sda2
> 
> Bug or feature?

bind mount or some userspace from LinuxOnDesktop crowd is actually mounted it second time.
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