btrfs: Use btrfs_mark_bg_unused to replace open code
Introduce a small helper, btrfs_mark_bg_unused(), to acquire locks and add a block group to unused_bgs list. No functional modification, and only 3 callers are involved. Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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