Method of Realizing File System in Embedded System

Abstract

The invention discloses a method for implementing a file system in an embedded system, which comprises the following steps of: establishing the file system consisting of a file information area and a file data area, wherein the file information area consists of a plurality of file information structures for describing each piece of file information respectively, and the file data area is used for storing files; initializing the file system; and establishing and maintaining the file information area by using a journal method, and when writing operation is performed on the files each time, after the files are written into the file data area, updating the records of the file information to the file information area. In the method, the file system is implemented, can modify the number of the files to be stored and total capacity according to configurations, has a power failure protection function, high file reading / writing operation efficiency and small code sizes, is less dependent on an operating system and convenient to port, and occupies fewer resources.

Description

technical field [0001] The invention relates to a file operation method, in particular to a method for realizing a file system in an embedded system. Background technique [0002] In the existing embedded file system technologies, most of them are FAT or Ext2fs file systems. Since FAT and Ext2fs and other file systems are based on IDEs that only support block devices like IDE, not only the code is relatively large, but also device erasure is not considered. Timing and timing requirements, no power-down protection. [0003] And for the JFFS2 file system dedicated to embedded systems. In addition to its own complexity, it is mainly designed to be used in the Linux operating system. It is highly dependent on the operating mechanism of the Linux operating system, so it is difficult to transplant; it is a log-based file system, which leads to a relatively slow startup speed. In addition, JFFS2 uses a probabilistic method to solve the wear balance, which is difficult to ensure t...

AI Technical Summary

Problems solved by technology

In addition to its own complexity, it is mainly designed to be used in the Linux operating system. It is highly dependent on the operating mechanism of the Linux operating system, so it is difficult to transplant; it is a log-based file system, which leads to a relatively slow startup speed.

In addition, JFFS2 uses a probabilistic method to solve the loss balance, which is difficult to ensure the determinism of the loss balance, which to a certain extent causes unnecessary erase operations on the erase block

[0004] Therefore, the current file systems of embedded systems place too much emphasis on generality, while ignoring the special requirements of embedded systems for file systems.

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