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This reproduces the bug fixed by "btrfs: fix incorrect splitting in btrfs_drop_extent_map_range", we were improperly calculating the range for the split extent. Add a test that exercises this scenario and validates that we get the correct resulting extent_maps in our tree. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>