From: Josef Bacik <jbacik@fusionio.com>
Date: Mon, 12 Aug 2013 19:36:44 +0000 (-0400)
Subject: Btrfs: don't allow a subvol to be deleted if it is the default subovl
X-Git-Tag: v3.12-rc1~40^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=175a2b871f46272a2aedce5fb3222a72568b84c3;p=pandora-kernel.git

Btrfs: don't allow a subvol to be deleted if it is the default subovl

Eric pointed out that btrfs will happily allow you to delete the default subvol.
This is a problem obviously since the next time you go to mount the file system
it will freak out because it can't find the root.  Fix this by adding a check to
see if our default subvol points to the subvol we are trying to delete, and if
it does not allowing it to happen.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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