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Date: Tue, 26 Mar 2013 11:34:52 -0400
From: Josef Bacik <jbacik@fusionio.com>
To: anand jain <anand.jain@oracle.com>
CC: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: [bug] mount and /proc/mounts disagrees
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On Tue, Mar 26, 2013 at 09:24:02AM -0600, anand jain wrote:
> 
> 3.8.0+ #3
> 
> This happened after 'umount /btrfs' was interrupted by ctl-C
> 
> # mount | egrep btrfs
> /dev/mapper/mpathe on /btrfs type btrfs (rw,degraded)
> 
> # cat /etc/mtab | egrep btrfs
> /dev/mapper/mpathe /btrfs btrfs rw,degraded 0 0
> 
> # cat /proc/mounts | egrep btrfs
> # umount /btrfs
> umount: /btrfs: not mounted
> #
>

That's because your mount still uses /etc/mtab for some reason, I thought it had
stopped doing that and was using /proc/mounts?  Anyway it's just because the
entry made it into mtab, if umount and /proc/mounts says its not there then its
not there.  Thanks,

Josef