btrfs: hold a ref on the root in fixup_tree_root_location
Looking up the inode from an arbitrary tree means we need to hold a ref on that root. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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