Method and device for storing file backups and backup method for file systems

Abstract

The invention discloses a method and a device for storing file backups and a backup method for file systems. The storing method comprises the following steps that: the main file in the file system is configured with backup files; the main file and the backup file are pre-set with file headers; the file header mainly comprises verification codes for detecting the completeness of files; the completeness of the file is judged according to the file header; when the main file is complete while the backup file is incomplete, the main file covers the backup file; when the backup file is complete while the main file is incomplete, the backup file covers the main file. Incompleteness of files can be judged according to the file header by adopting the invention and the incomplete file is restored by another file (main / backup file) so as to guarantee the completeness of main / backup files.

Description

Technical field [0001] The present invention relates to information storage technology, in particular to a file backup storage method, device and file system backup method. Background technique [0002] For most embedded system applications, there are usually three ways to save information: First, save it in EEPROM. Its advantages are low cost and simple usage; its disadvantage is that there is less information that can be stored, usually only 128 bytes, which is obviously not enough for some relatively complex embedded applications. In addition, it is slow to read and write. Second, save it in SPI Flash. Its advantages are low cost, and the information that can be stored is larger than EEPROM, usually more than 2M bytes; its disadvantage is that although the read and write speed is faster than EEPROM, it still cannot meet some applications with high real-time requirements. Third, save it in Nor Flash or Nand Flash. Its advantage is that the amount of information that can be s...

AI Technical Summary

Problems solved by technology

In the third way, there are the following specific ways of use: 1. Data storage, reading and writing are all realized by directly reading and writing Flash. The advantage is that the reading and writing speed is fast without going through the middleware of the operating system layer; The process of reading and writing Flash and the organization and conversion of information structures must be realized by ourselves. It is necessary to have a deep understanding of the operating principles and modes of Flash, which is difficult to implement and difficult to guarantee reliability. less and less desirable

2. It is implemented through the file system layer provided by the operating system layer. The advantage is that the operation is simple, and all data storage and reading are completed by reading and writing files; the disadvantage is that the efficiency is reduced due to passing through the operating system layer.

In this way, there is a problem to be solved: during the file writing process, if some kind of abnormality occurs, such as sudden power failure of the system, abnormal interruption, etc., it will cause the problem of whether the file is complete, and what is more serious is to directly destroy the file system.

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