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void journal_commit_transaction(journal_t *journal){	err = journal_submit_data_buffers(journal, commit_transaction,					  write_op);//先刷数据	while (commit_transaction->t_buffers) {		descriptor = journal_get_descriptor_buffer(journal);		=>struct journal_head *journal_get_descriptor_buffer(journal_t *journal)		{			err = journal_next_log_block(journal, &blocknr);//获取日志块		}	}}

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