Interface system for accessing file system in user space and file reading and writing method

Abstract

The invention discloses an interface system which can access a file system in a user space and a method for file reading and writing. The interface system comprises a dynamic link library which is used for providing an access interface of the file system and embedded in an application process address space to operate, and also comprises a shared memory module and an agent process module, wherein,the dynamic link library is connected with the shared memory module through communication; the shared memory module is used for exchanging and sharing relevant data between the processes and storing part of relevant data; the application process is linked with the shared memory module through the dynamic link library and sends parameters which read relevant data to the shared memory module; the shared memory module determines the read relevant data according to the parameters; and if the relevant data exists in the shared memory module, the shared memory module then sends the relevant data toa corresponding buffer area of the application process. Additionally, the invention adopts a sharing mechanism to improve the system processing efficiency.

Description

technical field [0001] The invention relates to a data storage and access technology in a UNIX or Linux operating system, in particular to an interface system and a file reading and writing method for accessing a file system in user space. Background technique [0002] At present, there are often a large number of media data storage and access requirements in business operations such as the Internet and telecommunications. These requirements generally require large storage capacity, high reliability, and low cost, and general-purpose file systems generally cannot meet the requirements. In general, it is necessary to develop a file system that meets specific requirements, and for upper-layer business, the interface for accessing the file system should remain stable and highly compatible. There are two commonly used solutions at present. The first one is to use the characteristics of the operating system kernel to reside a module in the kernel as a proxy. Data access and mani...

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Problems solved by technology

[0003] Both methods in the prior art have their advantages and disadvantages. For the method of the first solution for the kernel proxy module, the advantage is that the application program can access this file system without modifying the code, and multiple user processes can simultaneously access, but because the actual file system data processing process is also located in the user space, it is equivalent to adding an additional link to the file system access, which greatly reduces the system processing efficiency; for the second method, the file system access does not need There is no impact on the efficiency of the kernel, but because the address spaces between application processes are isolated from each other, if multiple application processes need to access the same file in the file system at the same time, the data of each file in these processes is stored in each application process Each has a copy, so this method is a huge waste of system resources

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