Data recovery method and device after abnormal power failure

Abstract

The invention discloses a data recovery method after abnormal power failure, which comprises the following steps: when equipment is powered on again, scanning all blocks on a partition to obtain all data blocks in the partition; and reading the data pages in all the data blocks, and deleting the data pages which fail to be read. By implementing the embodiment of the invention, the problem of data recovery after the abnormal power failure of the equipment can be solved on the premise of not backing up the system file, so that the equipment can be normally started after being powered on again, and the storage space of the equipment is saved.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a method and device for restoring data after abnormal power failure. Background technique [0002] For the current consumer electronics products, SPI NAND FLASH is often used as the storage medium; the embedded system based on the SPI NAND FLASH storage medium, the applied file system basically has a garbage collection design, and this garbage collection is a background The execution thread, as long as the background is idle, or when there are few available data blocks, the garbage collection thread will execute to move the data on SPINAND. There is always the possibility of an abnormal power failure. If these files happen to be moved and written to another block during the garbage collection process of the system, and the power is cut off at this time, then this page may be due to incomplete data writing. , For example, if the ECC data of OOB is not written down, then there w...

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Problems solved by technology

[0002] For the current consumer electronics products, SPI NAND FLASH is often used as the storage medium; the embedded system based on the SPI NAND FLASH storage medium, the applied file system basically has a garbage collection design, and this garbage collection is a background The execution thread, as long as the background is idle, or when there are few available data blocks, the garbage collection thread will execute to move the data on SPINAND. There is always the possibility of an abnormal power failure. If these files happen to be moved and written to another block during the garbage collection process of the system, and the power is cut off at this time, then this page may be due to incomplete data writing. , For example, if the ECC data of OOB is not written down, then there will be an ECC error problem on this page, resulting in file corruption. In this way, when the power is turned on again, the damaged file will be read and cause an exception and cannot be started normally.

[0003] In order to solve the above problems, the existing technology adopts the method of file backup to repair the damaged data during abnormal power failure. The specific method is: all files are backed up. If any file data is damaged during the process, copy the corresponding backup file to the damaged file, and then re-read the file; but this method needs to take up twice as much storage space, and it is easy to cause insufficient storage space on the device The problem

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