Abnormal power failure data recovery method

Abstract

The invention discloses an abnormal power failure data recovery method, which comprises the concrete realization processes that: three regional spaces including a file system region, a tax data region and a redundant backup region are set in a data memory of an embedded network billing machine; a redundant backup program runtime library and an operation function library are encapsulated in the redundant backup region, and the operation function library comprises a file creating function, a reading function and a writing function; when tax data relevant affairs are stored in the tax data region, the affairs are firstly written into the redundant backup region, and after the submission of the affairs in the redundant backup region is completed, original files are written into the tax data region; and when abnormal power failure occurs, an affair power failure recovery program is started, and the data recovery is completed through the redundant backup region. Compared with the prior art, the abnormal power failure data recovery method has the advantages that important data such as invoice volume data and invoice details of network billing can be enabled to realize synchronous storage; the service execution integrity is ensured; and the safe storage requirement of the machine is improved.

Description

technical field [0001] The invention relates to the field of information communication technology, in particular to the field of tax industry and a method for recovering abnormal power-off data. Background technique [0002] At present, the file system used by the tax network invoicing machine may have the hidden danger of file damage when the power is off, including the Yaffs2, Jffs2 file system, etc. The main problem is that the data recovery mechanism of the log file system is not perfect. A large amount of cached data cannot be saved in time, so the requirements for safe storage of important data cannot be met. Based on this, a method for recovering abnormal power-off data is provided. This method considers the design of dual mutual backup in the embedded system. Mechanism, double backup for reading and writing of important data to ensure safe storage of data, even if the original file is damaged, it can be restored through the backup file. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0002] At present, the file system used by the tax network invoicing machine may have the hidden danger of file damage when the power is off, including the Yaffs2, Jffs2 file system, etc. The main problem is that the data recovery mechanism of the log file system is not perfect. A large amount of cached data cannot be saved in time, so the requirements for safe storage of important data cannot be met. Based on this, a method for recovering abnormal power-off data is provided. This method considers the design of dual mutual backup in the embedded system. Mechanism, double backup for reading and writing of important data to ensure safe storage of data, even if the original file is damaged, it can also be restored through the backup file

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