Btrfs: create a helper for getting chunk map
We have similar code here and there, this merges them into a helper. Signed-off-by: NLiu Bo <bo.li.liu@oracle.com> Reviewed-by: NQu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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