-u64 bch2_journal_last_unwritten_seq(struct journal *);
-int bch2_journal_open_seq_async(struct journal *, u64, struct closure *);
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-void bch2_journal_wait_on_seq(struct journal *, u64, struct closure *);
-void bch2_journal_flush_seq_async(struct journal *, u64, struct closure *);