JBD2_JOURNAL_REQ_FLAGS
blk_opf_t write_flags = JBD2_JOURNAL_REQ_FLAGS;
write_dirty_buffer(journal->j_chkpt_bhs[i], JBD2_JOURNAL_REQ_FLAGS);
blk_opf_t write_flags = REQ_OP_WRITE | JBD2_JOURNAL_REQ_FLAGS;
submit_bh(REQ_OP_WRITE | JBD2_JOURNAL_REQ_FLAGS,
write_flags |= JBD2_JOURNAL_REQ_FLAGS;
write_dirty_buffer(descriptor, JBD2_JOURNAL_REQ_FLAGS);