extern int journal_set_revoke(journal_t *, unsigned long, tid_t);
extern int journal_test_revoke(journal_t *, unsigned long, tid_t);
extern void journal_clear_revoke(journal_t *);
-extern void journal_brelse_array(struct buffer_head *b[], int n);
extern void journal_switch_revoke_table(journal_t *journal);
/*