Protection method and system for user-mode nonvolatile memory file system

Abstract

The invention provides a protection method and system for a user-mode nonvolatile memory file system. The protection method comprises the steps that 1, the nonvolatile memory file system and application program codes are isolated in a user mode through a memory protection key mechanism; 2, dividing a nonvolatile memory of the user mode file system into a plurality of regions, and isolating the regions; thirdly, file system errors and abnormalities are processed in a user mode, and abnormal termination of an application program due to data errors in a file system is prevented. The invention provides a protection and isolation mechanism for a user mode nonvolatile memory file system. Data and metadata of the user-mode nonvolatile memory file system are prevented from being damaged randomly due to defects and errors of an application program; according to the method, metadata errors can be isolated in a certain area, errors are prevented from scattering to the whole file system, abnormaltermination of an application program due to the errors in the user mode file system can be prevented, and the reliability, robustness and availability of the whole system are improved.

Description

technical field [0001] The present invention relates to the field of storage technology, in particular to a protection method and system for a user state non-volatile memory file system. Background technique [0002] Non-volatile memory has low latency and high throughput similar to ordinary memory, and also has the non-volatility and high density of storage devices. At the same time, non-volatile memory can be addressed at byte granularity, and can be accessed like ordinary memory using the processor's load / store instructions. Therefore, non-volatile memory can be managed directly in userland. [0003] The emergence of non-volatile memory makes the user mode file system more efficient. Traditional user-mode file systems require close cooperation with the kernel. For example, if you use the FUSE user-mode file system, when the application sends a system call, the information and data of the system call will be transmitted to the kernel first, and the kernel will forward a...

AI Technical Summary

Problems solved by technology

Flaws in the application can easily overwrite data and metadata in non-volatile memory, causing damage to the userland file system

At the same time, since the user-mode file system can access all non-volatile memory, when an error occurs in some metadata stored in the non-volatile memory, the code of the file system will incorrectly modify the non-volatile memory, resulting in an error in the The file system is sprawled and the entire file system gets corrupted

Finally, since the user mode file system and the application program are in the user mode, if a thread has a memory access exception in the user mode file system code, the entire application program will be terminated

This includes other threads that are manipulating non-volatile memory, which can cause file system data corruption

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