Although linux file systems have encompassed journal file systems since the journal file system , the next - generation file system , and the early reiserfs were made available , another area in which neither technical journalism nor corporate publicity sheds much light is distributed file systems 虽然linux文件系统从journal file system ( jfs )开始就包含了日志文件系统,但是下一代文件系统( xfs )和早期的reiserfs也被改造成对其可用,还有一个不管是技术媒体还是公司宣传都没有过多提及的领域就是分布式文件系统。
The research area covered by the thesis includes embedded system design , hardware infrastructure of embedded gis system , architecture of nand flash , error detect code / error check code and there algorithm , journal file system , gis file index , wear leveling for nand flash , file system page cache and write delay , dynamic compression in file system etc . first , the thesis first analysis the embedded gis status in quo , technology background , difficulty it facing 本文研究领域涉及嵌入式系统开发、嵌入式gis系统软硬件框架、 nand芯片体系结构、差错检测差错校验( edc ecc )算法、日志文件系统、文件索引、芯片擦写平衡、文件系统页面cache与延迟写技术、文件系统实时压缩等技术。
Then introduce the embedded gis hardware infrastructure , and using two level of flash storage system to store different kinds of files . the theory of journal file system is introduced and a journal file system for nand flash chip is designed under for linux kernel 本文首先全面分析了嵌入式gis的研究现状、技术背景、面临的问题;然后提出了一个低成本嵌入式gis系统的硬件设计方案,该方案使用了两级flash的存储模式来存储不同类型的文件;接下来阐述了了日志文件系统的基本原理,并且在此基础上设计了一个linux平台下适用于nand芯片的日志文件系统。