Address mapping method and apparatus for flash storage system

Abstract

Embodiments of the invention disclose an address mapping method and apparatus for a flash storage system. The method comprises the steps of judging whether a data request from a file system is a write request or a read request; when the data request is judged to be the read request, accessing a first-level address mapping table preset in a cache, a second-level address mapping table preset in a memory and a flash address region in sequence according to a logic page address of data until a corresponding address mapping table item is found and a corresponding physical page address is obtained from the address mapping table item, then reading the data from the physical page address, and updating the first-level address mapping table according to the logic page address and the physical page address of the data; and when the data request is judged to be the write request, writing the data in the physical page address according to the logic page address of the data, and updating the first-level address mapping table according to the logic page address and the physical page address of the data. By adopting the scheme, the memory space required for storing address mapping table items is greatly reduced, the read-write performance of the flash storage system can be effectively improved, and the system response time is shortened.

Description

technical field [0001] The invention belongs to the technical field of data storage, and in particular relates to an address mapping method and device for a flash memory storage system. Background technique [0002] With the development of semiconductor technology and computer architecture, flash memory storage system, as a non-volatile storage system, gradually replaces the traditional Electromagnetic storage devices are widely used in embedded systems. Embedded system is application-centric, based on computer technology, software and hardware can be tailored, and is suitable for special-purpose computer systems that have strict requirements on function, reliability, cost, volume, and power consumption. Among them, the storage system is an important part of the embedded system. At present, flash memory storage systems mainly include NAND and NOR. Due to the higher storage density and faster writing speed of NAND flash memory, flash memory storage systems based on NAND fla...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an address mapping method and device for a flash memory storage system, which is used to solve the problem that in the prior art, the operation of frequently updating and writing the address mapping entries into the flash memory will cause a large number of physical pages to be written in the flash memory storage system operation, and trigger the garbage collection operation of the physical block in advance, and also seriously affect the read and write speed of the flash storage system

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