基于日志的闪存文件系统的设计

日志文件系统的主要设计思想是跟踪文件系统的变化,在日志节点中记录对文件所作的修改信息.FAT、JFFS、YAFFS等文件系统由于擦写频率过高,对闪存储介质的某些块造成较大的负担从而导致存芯片失效.文章设计的基于日志的闪存文件系统对存取采用的是追加模式,能很好地均衡读写频率,将该系统应用于嵌入式GIS系统,取得较好的效果,但在效率上还有待提高.

Designing a Journaling File System for NAND Flash

The main idea of the journaling file system is to trace file system changes, that is, the node log records the information of the files changes. Ordinary file system will tend to have some flash memory block repeatedly read and written which leading to chip block failure. This paper designs a NAND-Flashbased journaling file system （NJFS）, which adopts additional right to read and write flash memory. Therefore, it gets a better balance the flash block reads and writes. The system is Alpha used in the embedded GIS system and achieved good results, but the efficiency need to be improved.