Btrfs: prevent qgroup destroy when there are still relations
Currently you can just destroy a qgroup even though it is in use by other qgroups or has qgroups assigned to it. This patch prevents destruction of qgroups unless they are completely unused. Otherwise destroy will return EBUSY. Reported-by: NEric Hopper <hopper@omnifarious.org> Signed-off-by: NArne Jansen <sensille@gmx.net> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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