事务型文件系统存储管理机制的研究与实现

论述了事务型文件系统，提出了能够确保文件系统高效性的缓冲管理机制，结合LRU算法和高效的写合并策略，通过专用的写合并缓冲区极大地提高了数据的平均写回速率；提出了能够保证文件系统一致性的外存管理机制，采用灵活的写保护策略，通过对外存数据块进行状态标识，确保写回数据不会覆盖原有数据，保证了事务点回滚时的数据一致性。通过在嵌入式实时操作系统环境中的测试，证明了上述机制有效提升了事务型文件系统的时效性和可靠性。

Study and Implementation of Storage Management Mechanism for Transactional File System

This paper briefly introduces a transactional file system(TFS).It proposes a buffering management mechanism for assuring its high efficiency.The mechanism uses a LRU algorithm and efficient write merger strategy,which can greatly improve the data′s average write-back rate through a special merger buffer.It also proposes an external storage management mechanism for TFS consistency.The mechanism adopts a flexible write-protect strategy by state marking on external storage′s data blocks,which can ensure the write-back data can′t cover the original data and can keep data consistency when transactional point is rolling back.Testing results in embedded real-time operating system environment prove the mechanisms above can efficiently improve the performance and reliability of the transactional file system.