File operation method of embedded system

Abstract

The invention discloses a file operation method of an embedded system. The method comprises the following steps: storing operational data to be read and written in the embedded system in the read / write partition of a Flash memory, setting the other partitions of the Flash memory as read-only partitions; copying a first file from the read-only partitions to the RAM, generating a second file in theRAM; reading operational data from the read / write partition, updating the second file with the operational data; and modifying the data in the second file according to the application requirement of the application program, and correspondingly updating the operational data in the read / write partition with the modified second file. The data which are needed to modify and the data which are not needed to modify are separated to store in a file manner respectively and only required data in the file are carried out on write operation, thus avoiding damaging the file system of the embedded device and increasing the file security of the embedded device.

Description

technical field [0001] The invention relates to a file protection method, in particular to a file operation method for protecting file security in an embedded system. Background technique [0002] The Flash memory of an embedded system generally sets partitions: boot loader (boofloader) partition, kernel (kernel) partition, root file system (rootfs) partition, and even an application partition (usrfs). The files that need to be read and written are stored according to the Root file system partition or application partition. Of course, the Flash memory of individual embedded systems has a special partition for storing files that need to be read and written, and the application program directly reads and writes the files in this partition. [0003] In addition, the file system of the embedded device (hereinafter referred to as the embedded file system) needs to read and write very few files in use, and the files (such as configuration files) that need to be read and written a...

AI Technical Summary

Problems solved by technology

[0005] 1. It is easy for the partition storing files to be damaged, or even the file system to be damaged

[0006] If the files that need to be read and written in the existing file system are stored separately in the directory of the Flash memory partition or the root file system partition, the read and write operations on these files may cause the entire partition to be destroyed in some cases, or even cause the entire file system to be damaged. destroyed

Even if there is a special partition to store the files that need to be read and written, because the existing method is that the entire file can be read and written, if the underlying driver of the embedded system is unstable or the file system is unstable or other reasons will cause read and write Serious consequences such as damage to the entire partition and loss of files during file writing operations

[0007] 2. The existing repair method for the file system is cumbersome and takes a long time

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