From e43f998e47bae27e37e159915625e8d4b130153b Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Fri, 6 Dec 2013 17:51:32 +0100
Subject: [PATCH] btrfs: call mnt_drop_write after interrupted subvol deletion

If btrfs_ioctl_snap_destroy blocks on the mutex and the process is
killed, mnt_write count is unbalanced and leads to unmountable
filesystem.

CC: stable@vger.kernel.org
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
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