Power-down prevention Linux system startup method

Abstract

The invention discloses a power-down prevention Linux system startup method. The method is a union file system method and comprises an initialization step and a folder recovery step. In the initialization step, four key folders such as / etc, / root, / var and / tmp of a root file system are remounted into four empty read-write folders of a memory file system in a way of remounting of a file system; in the folder recovery step, the first three empty read-write folders of a memory file system is combined with corresponding read-only system folders on a disk by calling related commands of union folders, so that the first three empty read-write folders comprise the contents of the corresponding read-only system folders on the disk. By the method, in the process of system startup and operation, system folders are written in the memory instead of the disk, so the file system is protected and a perfect power-down prevention scheme is realized.

Description

technical field [0001] The invention relates to a booting method of a Linux system, in particular to a booting method against power failure. Background technique [0002] In Linux customized systems such as information distribution systems and set-top box systems, there is such a requirement in practical applications, that is, after the user directly powers off the power, the operating system in the box can still be started normally, and it is not allowed to occur due to sudden power failure. The file system is damaged and the operating system cannot be started normally. [0003] For this kind of situation, the common practice is to use a journaled file system, that is, to check and repair the disk based on the log, which greatly reduces the consistency of the file system when the file system encounters unpredictable events such as power failure. The time required can be said that this method can basically solve the problem of corrupted file system in the case of sudden pow...

AI Technical Summary

Problems solved by technology

[0004] As far as the file systems commonly used under Linux are concerned, whether it is EXT2, EXT3, XFS, or REISERFS, regardless of whether they support the log writing function to the disk, they cannot avoid writing to the disk.

And as long as there is physical writing to the disk, there is the possibility of file damage, and the operating system also has the hidden danger of instability or even complete inoperability due to file loss or damage.

Images