jbd2_journal_bmap
err = jbd2_journal_bmap(journal, block, &phys_block);
return jbd2_journal_bmap(journal, blocknr, retp);
ret = jbd2_journal_bmap(journal, blocknr, &pblock);
err = jbd2_journal_bmap(journal, offset, &blocknr);
int err = jbd2_journal_bmap(journal, next, &blocknr);
extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);