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...

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